chore(deps): update actions/cache action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
           java-version: 21
           distribution: temurin
       - name: Cache local Maven repository
-        uses: actions/cache@v5.0.5
+        uses: actions/cache@v6.1.0
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}