Bump actions/cache version

Author: rzvoncek

.github/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
         with:
           java-version: 1.8
       - name: Cache Maven packages
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}