Bump actions/checkout from 4.3.1 to 6.0.2

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.3.1 to 6.0.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@34e1148...de0fac2)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
     - name: Install uv
       uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86  # v5
     - name: Check formatting
@@ -24,7 +24,7 @@ jobs:
         python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', 'pypy3.9', 'pypy3.11']
 
     steps:
-    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5
       with: