ci: 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)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/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>

.github/workflows/backport.yml

@@ -34,7 +34,7 @@ jobs:
           permission-contents: write
           permission-pull-requests: write
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           token: ${{ steps.app-token.outputs.token }}
           ref: ${{ github.event.pull_request.head.sha }}

.github/workflows/flakehub-publish-rolling.yml

@@ -14,7 +14,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: "actions/checkout@v6"
+      - uses: "actions/checkout@v7"
       - uses: "DeterminateSystems/nix-installer-action@main"
       - uses: "DeterminateSystems/flakehub-push@main"
         with:

.github/workflows/lint.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Install Nix
         uses: cachix/install-nix-action@v31
       - name: Run nix and Lix parse checks

.github/workflows/pr-merged.yml

@@ -75,7 +75,7 @@ jobs:
       # This ensures we get the latest scripts, even if the PR's base was outdated.
       - name: Checkout base branch
         id: checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           sparse-checkout: |
             flake/dev/diff-plugins.py

.github/workflows/tag-maintainers.yml

@@ -40,7 +40,7 @@ jobs:
       # Checkout the code from the base branch.
       # This is a security measure for `pull_request_target` to run trusted code.
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           ref: ${{ github.base_ref }}
 

.github/workflows/update-maintainers.yml

@@ -60,7 +60,7 @@ jobs:
           } >> "$GITHUB_OUTPUT"
 
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           token: ${{ steps.app-token.outputs.token || github.token }}
 

.github/workflows/update-other.yml

@@ -22,7 +22,7 @@ jobs:
       branches: ${{ steps.list-branches.outputs.result }}
     steps:
       - name: Checkout version-info
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           sparse-checkout: version-info.toml
           sparse-checkout-cone-mode: false

.github/workflows/update.yml

@@ -79,7 +79,7 @@ jobs:
           git config --global user.email "$email"
 
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           token: ${{ steps.app-token.outputs.token }}
 

.github/workflows/website.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout version-info
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           sparse-checkout: version-info.toml
           sparse-checkout-cone-mode: false