Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/check_update.yml

@@ -20,7 +20,7 @@ jobs:
       actions: write
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         env:
           TOKEN: ${{ secrets.TOKEN }}
       - run: |

.github/workflows/docker-ci.yml

@@ -71,7 +71,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.RELEASE_VERSION }}
 
@@ -132,7 +132,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.RELEASE_VERSION }}
 
@@ -188,7 +188,7 @@ jobs:
           swap-storage: true
 
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.RELEASE_VERSION }}
 

.github/workflows/docker-publish.yml

@@ -56,7 +56,7 @@ jobs:
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
 
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.RELEASE_VERSION }}