Update GH workflow to J17 again

.github/workflows/main.yml

@@ -9,10 +9,10 @@ jobs:
         uses: actions/checkout@v4
       - name: Validate Gradle Wrapper
         uses: gradle/wrapper-validation-action@v1
-      - name: Set up JDK 8
+      - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
-          java-version: 8
+          java-version: 17
           distribution: 'temurin'
           check-latest: true
       - name: Cache Dependencies