ci(deps): bump actions/checkout from 4 to 6 in the github-actions group

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 4 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

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

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

Author: dependabot[bot]

.github/workflows/bootstrap-template.yaml

@@ -11,7 +11,7 @@ jobs:
     if: github.actor != 'github-actions[bot]'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Set up Python

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
   qa:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: pre-commit/action@v3.0.1
   test:
     needs: qa
@@ -26,7 +26,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install uv and Python
       uses: astral-sh/setup-uv@v7
       with: