v4 actions

Author: sebastian

.github/workflows/build.yml

@@ -10,14 +10,14 @@ jobs:
     name: Build and Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK 21
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: 21
           distribution: 'temurin'
       - name: Cache Maven packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}