[Composer] Bumped dependencies for 2.1.0 release (#11)

For more details see #11

Key changes:

* [Composer] Bumped PHP-CS-Fixer to v3.75.0

* [Composer] Bumped PHPStan to ^2.0

* [Composer] Bumped branch alias to 2.1.x-dev

* [GHA][CI] Added PHP 8.3 to test matrix

---------

Co-Authored-By: Adam Wójs <adamwojs@users.noreply.github.com>

Author: alongosz

.github/workflows/ci.yaml

@@ -20,6 +20,7 @@ jobs:
           - '7.4'
           - '8.0'
           - '8.1'
+          - '8.3'
 
     steps:
       - uses: actions/checkout@v4

composer.json

@@ -14,12 +14,12 @@
     },
     "require": {
         "php": ">=7.4",
-        "friendsofphp/php-cs-fixer": "v3.54.0",
+        "friendsofphp/php-cs-fixer": "v3.75.0",
         "adamwojs/php-cs-fixer-phpdoc-force-fqcn": "^2.0"
     },
     "require-dev": {
         "roave/security-advisories": "dev-master",
-        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan": "^2.0",
         "phpunit/phpunit": "^9.6"
     },
     "autoload": {
@@ -40,7 +40,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-main": "2.0.x-dev"
+            "dev-main": "2.1.x-dev"
         }
     }
 }