Add php 8.3/4 to test versions

Author: JulianVennen

.github/workflows/tests.yaml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.1', '8.2' ]
+        php-version: [ '8.1', '8.2', '8.3', '8.4' ]
 
     name: Run tests on PHP v${{ matrix.php-version }}
 
@@ -43,4 +43,4 @@ jobs:
       - name: Run phpunit tests
         run: vendor/bin/phpunit --colors=always --testdox
         env:
-          CURSEFORGE_API_KEY: ${{ secrets.CURSEFORGE_API_KEY }}
+          CURSEFORGE_API_KEY: ${{ secrets.CURSEFORGE_API_KEY }}