Bump psf/black from 24.8.0 to 26.3.0 in /.github/workflows

[dependabot]

Bumps psf/black from 24.8.0 to 26.3.0.

Release notes

Sourced from psf/black's releases.

26.3.0

Stable style

• Don't double-decode input, causing non-UTF-8 files to be corrupted (#4964)
• Fix crash on standalone comment in lambda default arguments (#4993)
• Preserve parentheses when # type: ignore comments would be merged with other comments on the same line, preventing AST equivalence failures (#4888)

Preview style

• Fix bug where if guards in case blocks were incorrectly split when the pattern had a trailing comma (#4884)
• Fix string_processing crashing on unassigned long string literals with trailing commas (one-item tuples) (#4929)
• Simplify implementation of the power operator "hugging" logic (#4918)

Packaging

• Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments (#4930)

Performance

• Introduce winloop for windows as an alternative to uvloop (#4996)
• Remove deprecated function uvloop.install() in favor of uvloop.new_event_loop() (#4996)
• Rename maybe_install_uvloop function to maybe_use_uvloop to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop (#4996)

Output

• Emit a clear warning when the target Python version is newer than the running Python version, since AST safety checks cannot parse newer syntax. Also replace the misleading "INTERNAL ERROR" message with an actionable error explaining the version mismatch (#4983)

Blackd

• Introduce winloop to be used when windows in use which enables blackd to run faster on windows when winloop is installed. (#4996)

Integrations

• Remove unused gallery script (#5030)
• Harden parsing of black requirements in the GitHub Action when use_pyproject is enabled so that only version specifiers are accepted and direct references such as black @ https://... are rejected. Users should upgrade to the latest version of the action as soon as possible. This update is received automatically when using psf/black@stable, and is independent of the version of Black installed by the

... (truncated)

Changelog

Sourced from psf/black's changelog.

26.3.0

Stable style

• Don't double-decode input, causing non-UTF-8 files to be corrupted (#4964)
• Fix crash on standalone comment in lambda default arguments (#4993)
• Preserve parentheses when # type: ignore comments would be merged with other comments on the same line, preventing AST equivalence failures (#4888)

Preview style

• Fix bug where if guards in case blocks were incorrectly split when the pattern had a trailing comma (#4884)
• Fix string_processing crashing on unassigned long string literals with trailing commas (one-item tuples) (#4929)
• Simplify implementation of the power operator "hugging" logic (#4918)

Packaging

• Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments (#4930)

Performance

• Introduce winloop for windows as an alternative to uvloop (#4996)
• Remove deprecated function uvloop.install() in favor of uvloop.new_event_loop() (#4996)
• Rename maybe_install_uvloop function to maybe_use_uvloop to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop (#4996)

Output

• Emit a clear warning when the target Python version is newer than the running Python version, since AST safety checks cannot parse newer syntax. Also replace the misleading "INTERNAL ERROR" message with an actionable error explaining the version mismatch (#4983)

Blackd

• Introduce winloop to be used when windows in use which enables blackd to run faster on windows when winloop is installed. (#4996)

Integrations

• Remove unused gallery script (#5030)
• Harden parsing of black requirements in the GitHub Action when use_pyproject is enabled so that only version specifiers are accepted and direct references such as black @ https://... are rejected. Users should upgrade to the latest version of the action as soon as possible. This update is received automatically when using

... (truncated)

Commits

• 35ea679 Prepare release 26.3.0 (#5032)
• 4d81750 Remove gallery/ (#5030)
• 0a2560b Harden Black action version parsing (#5031)
• deab5d6 Revert "Bump hatch from 1.15.1 to 1.16.4" (#5028)
• 2beece7 Bump hatch from 1.15.1 to 1.16.4 (#5020)
• d764c0b Bump actions/upload-artifact from 6.0.0 to 7.0.0 (#5024)
• f5be8e0 Bump actions/download-artifact from 7.0.0 to 8.0.0 (#5019)
• 8b9d3e3 add winloop support and remove deprecated functionality from uvloop (#4996)
• 457320a [pre-commit.ci] pre-commit autoupdate (#5018)
• 4da809e Do not encourage the use of an obsolete GitHub Actions (#5016)
• Additional commits viewable in compare view

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[Copilot]

Pull request overview

Updates the Black formatter used in CI and applies formatting-only cleanups, but also introduces broader Python version support and tooling configuration changes that don’t match the PR title/description.

Changes:

• Bump psf/black GitHub Action from 24.8.0 to 26.3.0 and widen the dev requirement to black < 27.0.0.
• Remove a few stray blank lines (formatting-only) in samples and package modules.
• Update Python version classifiers / minimum version metadata and expand the CI Python matrix (notably including 3.14).

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
setup.py	Updates Python classifiers and bumps python_requires to >=3.10.
pyproject.toml	Updates Python classifiers (but leaves requires-python unchanged).
mypy.ini	Changes mypy target python_version to 3.14.
dev_requirements.txt	Updates Black version constraint to allow 26.x.
.github/workflows/validate.yml	Bumps psf/black action version and changes the Python test matrix to 3.10–3.14.
samples/feature_variant_sample_with_telemetry.py	Removes an extra blank line.
samples/feature_variant_sample_with_targeting_accessor.py	Removes an extra blank line.
samples/feature_variant_sample.py	Removes an extra blank line.
featuremanagement/azuremonitor/__init__.py	Removes an extra blank line.
featuremanagement/_time_window_filter/_recurrence_validator.py	Removes an extra blank line.
featuremanagement/_featuremanagerbase.py	Removes an extra blank line.

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