Update dependencies in composer.lock and enhance CI configuration

- Updated various package versions in composer.lock, including justinrainbow/json-schema, league/uri, and symfony components to their latest versions.
- Modified CI workflow to include PHP versions 8.1, 8.2, 8.3, and 8.4, and added support for PHPUnit versions 10, 11, and 12.
- Added `CoversClass` attributes to OpenAPISchemaValidatorTest and OpenAPISymfonySchemaValidatorTest for better test coverage reporting.

Author: floriankraemer

.github/workflows/ci.yaml

@@ -10,7 +10,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-version: ['8.3', '8.4']
+        php-version: ['8.1', '8.2', '8.3', '8.4']
+        phpunit-version: ['10', '11', '12']
 
     steps:
       - uses: actions/checkout@v4
@@ -26,22 +27,20 @@ jobs:
           coverage: pcov
 
       - name: Composer install
-        run: |
-          if [[ ${{ matrix.prefer-lowest == 'prefer-lowest' }} ]]; then
-            composer update --prefer-stable
-          else
-            composer install
-          fi
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Install PHPUnit ${{ matrix.phpunit-version }}
+        run: composer require --dev phpunit/phpunit:^${{ matrix.phpunit-version }}.0 --no-interaction
 
       - name: Run PHPUnit
         run: |
-          if [[ ${{ matrix.php-version }} == '8.3' ]]; then
+          if [[ ${{ matrix.php-version }} == '8.3' && ${{ matrix.phpunit-version }} == '11' ]]; then
             bin/phpunit --coverage-clover=coverage.xml
           else
             bin/phpunit
           fi
       - name: Code Coverage Report
-        if: success() && matrix.php-version == '8.2'
+        if: success() && matrix.php-version == '8.3' && matrix.phpunit-version == '11'
         uses: codecov/codecov-action@v4
 
   code-analysis:
@@ -56,7 +55,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: ${{ matrix.php-version }}
+          php-version: '8.4'
           extensions: json, fileinfo
           coverage: pcov
           tools: pecl