Use update GH cache action

Author: thomaskrause

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v1
       - name: Cache local Maven repository
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-java8-${{ hashFiles('**/pom.xml') }}
@@ -26,7 +26,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v1
       - name: Cache local Maven repository
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-java11-${{ hashFiles('**/pom.xml') }}