Bump actions/checkout from 5 to 6 in the actions group

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


Updates `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
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Format
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: astral-sh/setup-uv@v7
     - run: uvx hatch fmt
 
@@ -31,7 +31,7 @@ jobs:
     runs-on: ${{ matrix.runs-on }}
     name: Test • 🐍 ${{ matrix.python-version }} • ${{matrix.runs-on}}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
@@ -54,7 +54,7 @@ jobs:
 #    runs-on: ${{ matrix.runs-on }}
 #    name: Test • 🐍 ${{ matrix.python-version }} • ${{matrix.runs-on}}
 #    steps:
-#    - uses: actions/checkout@v5
+#    - uses: actions/checkout@v6
 #    - uses: actions/setup-python@v6
 #      with:
 #        python-version: ${{ matrix.python-version }}
@@ -74,5 +74,5 @@ jobs:
     runs-on: ubuntu-latest
     name: Build distribution
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: hynek/build-and-inspect-python-package@v2