feat: convert contentEncoding to typesafe enum (#423)

* feat: convert contentEncoding to typesafe enum

* Fix typo in Subscription.php comments

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Co-authored-by: Louis Lagrange <lagrange.louis@gmail.com>

chore: drop php8.1; add php8.5 (#435)

* chore!: drop php8.1; add php8.5

* increase required `web-token/jwt-library` to "^3.4.9|^4.0.6"
* drop phpunit10; add phpunit12; show notices and deprecations
* migrate php-cs-fixer config; apply auto migrations
* update Github Actions

* chore: migrations for php8.5

* remove deprecated `curl_close`
* remove deprecated param `key_length` for `openssl_pkey_derive`

fix: option for concurrency not working (#426)

option name seems to be accidentally renamed

feat: add contentType option (#433)

* Added contentType option to Notification

* Added contentType option to WebPush

* Updated README

Fix private VAPID key padding (#414)

fix: Exception type mismatch in rejected callback (#410)

Fixes #409

chore: allow jwt-library v4 (#404)

* chore: allow jwt-library v4

* Update composer.json

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Co-authored-by: Louis Lagrange <lagrange.louis@gmail.com>

Add test for base64 backward compatibility (#400)

* Base64 tests

* Fix test

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Co-authored-by: Louis Lagrange <lagrange.louis@gmail.com>

Replace `spomky-labs/base64url` with `paragonie/constant_time_encodin…

…g` (#397)

* Replace `spomky-labs/base64url` with `paragonie/constant_time_encoding`

* Directly using the `Base64UrlSafe` class

* Add composer package `paragonie/constant_time_encoding`

Drop eol php 7 (#361)

* Drop eol php 7.3 7.4

* Add php 8.2 to Github tests

* test with disabled `gmp` extension

* Add extension suggestion to composer

* Remove outdated php 7.x code