Bump actions/checkout from 5.0.0 to 6.0.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5.0.0...v6.0.1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/publish-package.yml

@@ -30,7 +30,7 @@ jobs:
       id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
 
     steps:
-    - uses: actions/checkout@v5.0.0
+    - uses: actions/checkout@v6.0.1
     - name: Set up Python
       uses: actions/[email protected]
       with:

.github/workflows/run-tests.yml

@@ -30,7 +30,7 @@ jobs:
           - platform: windows-latest
             python-version: 3.13
     steps:
-    - uses: actions/checkout@v5.0.0
+    - uses: actions/checkout@v6.0.1
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/[email protected]
       with: