Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
       commit_hash: ${{ steps.commit_changes.outputs.commit_hash }}
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Node
         uses: actions/setup-node@v5
@@ -61,7 +61,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod
           ref: ${{ needs.update_hugo_npm_dependencies.outputs.commit_hash }}

.github/workflows/readme-scribe.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: muesli/readme-scribe@v0.1
         env:

.github/workflows/renovate-hugo-modules.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout Pull Request HEAD Commit
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}