Update Java version

Author: klakegg

.github/workflows/maven.yaml

@@ -16,14 +16,15 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
 
-    - name: Set up JDK 1.8
+    - name: Set up JDK
       uses: actions/setup-java@v4
       with:
-        java-version: '8'
+        java-version: '21'
         distribution: corretto
+        cache: maven
 
     - name: Build with Maven
-      run: mvn clean package
+      run: mvn -B --no-transfer-progress clean package
 
     - name: Upload artifact [uber-jar]
       uses: actions/upload-artifact@v4