Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     name: Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Set up JDK 21

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ jobs:
 
       # first checkout your code
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up JDK 21
         uses: actions/setup-java@v5
         with:
@@ -76,7 +76,7 @@ jobs:
           cp ./CNAME ../docs
           cp ./.nojekyll ../docs
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: gh-pages
       - name: Copy back

.github/workflows/publish_docker_3key.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Cosign
         uses: sigstore/cosign-installer@v4.0.0

.github/workflows/publish_docker_czertainly.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Cosign
         uses: sigstore/cosign-installer@v4.0.0

.github/workflows/publish_harbor_3key.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Cosign
         uses: sigstore/cosign-installer@v4.0.0

.github/workflows/test_docker_image.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3