Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/retire.yml

@@ -58,7 +58,7 @@ jobs:
             echo "${PID}.yaml already exists!"
             exit 1
           fi
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Set up Ruby

.github/workflows/website.yml

@@ -34,19 +34,19 @@ jobs:
 
     steps:
       - name: 🗂 Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
         with:
           fetch-depth: 1
       - name: 🗂 Checkout asf-site branch with minimum depth (main only)
         if: ${{ (github.head_ref || github.ref_name) == 'main' }}
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # 6.0.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # 7.0.0
         with:
           ref: asf-site
           fetch-depth: 1
           path: asf-site
       - name: 🗂 Checkout cwiki-retired branch with minimum depth (main only)
         if: ${{ (github.head_ref || github.ref_name) == 'main' }}
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # 6.0.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # 7.0.0
         with:
           ref: cwiki-retired
           fetch-depth: 1