Fix unit test error

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
             version: 17
           }
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build with Maven
         run: echo y | mvn clean install -Dskip.gpg=true -Dspotless.apply.skip=true -Dmaven.javadoc.skip=true
 
@@ -71,15 +71,15 @@ jobs:
     name: Test coverage report
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache Maven Repos
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.m2/repository
           key: hippo4j-maven-third-party-${{ hashFiles('**/pom.xml') }}
           restore-keys: |
             hippo4j-maven-third-party-
-      - uses: actions/setup-java@v3
+      - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
           java-version: 8