chore(deps): update actions/checkout action to v6 (#1437)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build-image.yml

@@ -39,7 +39,7 @@ jobs:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       GH_REPO: ${{ github.repository }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Generate build variables
         id: build_vars
         run: |
@@ -138,7 +138,7 @@ jobs:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       GH_REPO: ${{ github.repository }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run tools
         env:
           CDN_NAME: 'updates.nethsecurity.nethserver.org'

.github/workflows/change-status-on-labels.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Determine new status on added label
         if: ${{ github.event.action == 'labeled' }}
         id: labeled

.github/workflows/cleanup.yml

@@ -15,7 +15,7 @@ jobs:
     name: Cleanup old versions
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Cleanup
         env:
           DO_SPACE_ACCESS_KEY: ${{ secrets.DO_SPACE_ACCESS_KEY }}

.github/workflows/jekyll-gh-pages.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Prepare Pages

.github/workflows/notify_testing.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install dependencies
         run: |

.github/workflows/release-stable.yml

@@ -27,7 +27,7 @@ jobs:
       RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
       RCLONE_CONFIG_SPACES_ACL: public-read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Extract versions
         id: versions
         run: |