Switch to actions/setup-java’s built-in caching

.github/workflows/test.yml

@@ -13,12 +13,6 @@ jobs:
         with:
           distribution: 'adopt'
           java-version: 11
-      - name: Cache local Maven repository
+          cache: 'maven'
-        uses: actions/cache@v2
-        with:
-          path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
       - name: Build with Maven
         run: mvn -e -B verify