Actions: cache with java version

.github/workflows/build.yml

@@ -42,7 +42,7 @@ jobs:
         uses: actions/[email protected]
         with:
           path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          key: ${{ runner.os }}-${{ matrix.java }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
           restore-keys: ${{ runner.os }}-gradle
 
       - name: chmod -R 777 *
@@ -84,7 +84,7 @@ jobs:
         uses: actions/[email protected]
         with:
           path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          key: ${{ runner.os }}-${{ matrix.java }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
           restore-keys: ${{ runner.os }}-gradle
 
       - name: chmod -R 777 *