build(deps): Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/matrix.yml

@@ -16,7 +16,7 @@ jobs:
           - flavor: makepkg-git
             architecture: i686
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: run in-place
         uses: ./
         with:

.github/workflows/npm-run-package.yml

@@ -17,7 +17,7 @@ jobs:
     if: github.event_name == 'workflow_dispatch' || github.event.repository.owner.login == 'git-for-windows'
     environment: git-for-windows-ci-push
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           repository: ${{ github.event.repository.full_name }}
           ref: ${{ inputs.branch }}${{ github.event.ref }}

.github/workflows/release-tag.yml

@@ -13,7 +13,7 @@ jobs:
     name: Publish GitHub Release from tag
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.PUSH_RELEASE_TRAINS_PAT }}
           fetch-depth: 0

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
   build: # make sure build/ci work properly
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: npm ci
       - run: npm run build
       - run: npm run lint
@@ -36,7 +36,7 @@ jobs:
   test: # make sure the action works on a clean machine without building
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run this Action in-place
         uses: ./
       - name: Verify that the Bash of Git for Windows' SDK is used