gradle.yml - update stuff

Author: ShaneBeee

.github/workflows/gradle.yml

@@ -23,12 +23,12 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
       - name: Build with Gradle
-        uses: gradle/gradle-build-action@bd5760595778326ba7f1441bcf7e88b49de61a25 # v2.6.0
+        uses: gradle/gradle-build-action@3.4.2
         with:
           arguments: build