chore: 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/pip.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: actions/setup-python@v6
       with:
@@ -51,7 +51,7 @@ jobs:
           mingw-w64-x86_64-python-pip
           mingw-w64-x86_64-python-wheel
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install pybind11
       # This is required because --no-build-isolation disable dependences

.github/workflows/wheels.yml

@@ -19,7 +19,7 @@ jobs:
     name: Build SDist
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Build SDist
       run: pipx run build --sdist
@@ -42,7 +42,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-13]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: pypa/[email protected]
       env: