Update gradle.yml (#551)

Author: puneetbehl

.github/workflows/gradle.yml

@@ -16,9 +16,6 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        java: ['11', '14']
     env:
       WORKSPACE: ${{ github.workspace }}
       GRADLE_OPTS: -Xmx1500m -Dfile.encoding=UTF-8
@@ -33,7 +30,7 @@ jobs:
         uses: actions/setup-java@v3
         with:
           distribution: 'adopt'
-          java-version: ${{ matrix.java }}
+          java-version: '11'
       - name: Run Tests
         if: github.event_name == 'pull_request'
         id: tests