Remove java version matrix for tests

Author: JulianVennen

.github/workflows/test.yml

@@ -12,16 +12,13 @@ concurrency:
 jobs:
   test:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        java: [11, 17, 21]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Java
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: ${{ matrix.java }}
+          java-version: 11
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
       - name: Build with Gradle