Bump actions/checkout from 5.0.0 to 6.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
 
       - name: Checkout the repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
 
       - name: Setup Python
         uses: actions/[email protected]
@@ -64,7 +64,7 @@ jobs:
     steps:
 
       - name: Checkout the repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
         with:
           # https://github.com/py-cov-action/python-coverage-comment-action/commit/2e8dc23
           fetch-depth: 1000

.github/workflows/deploy-docs.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
 
       - name: Checkout the repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
 
       - name: Setup Python
         uses: actions/[email protected]

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
 
       - name: Checkout the repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
 
       - name: Setup Python
         uses: actions/[email protected]