fix(ci): phpunit action fixes, added php 8.4

Author: ivuorinen

.github/workflows/phpunit.yml

@@ -19,8 +19,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [ '8.0', '8.1', '8.2', '8.3' ]
-        stability: [ 'stable', 'lowest' ]
+        php: [ '8.0', '8.1', '8.2', '8.3', '8.4' ]
 
     steps:
       - uses: actions/checkout@v4
@@ -61,7 +60,7 @@ jobs:
             ${{ runner.os }}-php-
 
       - name: Install Dependencies (prefer-${{ matrix.stability }})
-        run: composer install -q --no-ansi --no-interaction --no-scripts --no-progress --prefer-${{ matrix.stability }}
+        run: composer install -q --no-ansi --no-interaction --no-scripts --no-progress
 
       - name: Configure matchers
         uses: mheap/phpunit-matcher-action@v1