Merge pull request #20 from hyperledger-web3j/cacheActionv4

Update build.yml

Author: NickSneo

Diff for: .github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           java-version: 17
       - name: Cache Gradle packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}