Maintenance: Update actions/checkout action to v4

.github/workflows/ci.yaml

@@ -30,7 +30,7 @@ jobs:
       CI_SKIP_DB_RESET: 'true'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Cache node modules
         id: cache-npm
         uses: actions/cache@v3

.github/workflows/docker-ci.yaml

@@ -9,7 +9,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # # only needed for arm64 builds
       # - name: Set up QEMU
@@ -40,7 +40,7 @@ jobs:
           outputs: type=docker,dest=/tmp/zammad-local.tar
 
       - name: Checkout docker-compose files
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: zammad/zammad-docker-compose
           path: zammad-docker-compose

.github/workflows/docker-release.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
             fetch-depth: 0