Run client and resources tests on Java 21

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'microsoft'
-          java-version: '17'
+          java-version: '21'
       - name: Run Auto test Client
         uses: modmuss50/xvfb-action@v1
         with:
@@ -61,7 +61,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'microsoft'
-          java-version: '17'
+          java-version: '21'
       - run: mkdir run && echo "eula=true" >> run/eula.txt
       - run: ./gradlew runProductionAutoTestServer --stacktrace --warning-mode=fail