Update constraints in packages

Remove unused variables

Fix up more docblock sentences.

Fix up more docblock sentences.

Fix up more docblock sentences.

Add InstanceConfigTrait::deleteConfig(). (#19028)

Currently you have to call setConfig() with null value to delete a config,
which is not very ergonomic.

Improve type checks

Improve type checks

Fix PHP 8.5 deprecations: replace SplObjectStorage::contains() and re…

…move ReflectionProperty::setAccessible() (#18831)

* Fix PHP 8.5 deprecations: replace SplObjectStorage::contains() and remove ReflectionProperty::setAccessible()

* Update Debugger.php

* Update ci.yml

* Temporarily ignore PHP version constraint for 8.5

* Remove curl_close() call as it has no effect in PHP 8.0+

* Replace DATE_RFC7231

* Define DATE_RFC7231

* Define DATE_RFC7231

* Define DATE_RFC7231

* CAKE_DATE_RFC7231

* CAKE_DATE_RFC7231

* CAKE_DATE_RFC7231

* CAKE_DATE_RFC7231

* CAKE_DATE_RFC7231

* fix the he split packages phpstan failure

* fix the split packages phpstan failure

* Undo

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Co-authored-by: Arshid <arshid@Arshids-MacBook-Air.local>
Co-authored-by: ADmad <ADmad@users.noreply.github.com>

Fix some spelling and broken code snippets. (#18791)