Add 'cache: gradle' setting in GitHub workflow

The GitHub Actions workflow file (main.yml) has been updated with the 'cache: gradle' setting. This addition ensures that the dependencies are cached between workflow runs, decreasing the time it takes to install them.

.github/workflows/main.yml

@@ -33,6 +33,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: '${{ matrix.version }}'
+          cache: 'gradle'
 
       - name: Install Dependencies
         run: gradle resolveDependencies