Update gradle.yml (#415)

Author: Isaacwhyuenac

.github/workflows/gradle.yml

@@ -16,9 +16,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 15
+    - name: Set up JDK 17
       uses: actions/setup-java@v1
       with:
-        java-version: 15
+        java-version: 17
     - name: Build with Gradle
       run: ./scripts/runGradleBuilds.sh