Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/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
...

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

Author: dependabot[bot]

.github/workflows/doc-build.yml

@@ -21,7 +21,7 @@ jobs:
       PYTHON_VERSION: ${{ matrix.python-version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}

.github/workflows/linux-build.yml

@@ -26,7 +26,7 @@ jobs:
       PYTHON_VERSION: ${{ matrix.python-version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}

.github/workflows/macos-build.yml

@@ -23,7 +23,7 @@ jobs:
       MACOSX_DEPLOYMENT_TARGET: 10.14
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}

.github/workflows/wheel.yml

@@ -23,7 +23,7 @@ jobs:
         os: [ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-13, macos-14]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Build wheels
         uses: pypa/[email protected]

.github/workflows/windows-build.yml

@@ -24,7 +24,7 @@ jobs:
       PYTHON_VERSION: ${{ matrix.python-version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}