Bump actions/cache from 3 to 4 (#305)

Author: dependabot[bot]

.github/workflows/ci-config.yml

@@ -46,7 +46,7 @@ jobs:
         java-version: ${{ matrix.java }}
 
     - name: Cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.gradle/caches
         key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}