[gha] Bump actions/checkout from 5 to 6 (#20)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/documentation.yml

@@ -17,11 +17,11 @@ jobs:
 
     steps:
     - name: Checkout source repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         path: master
     - name: Checkout gh-pages repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: gh-pages
         path: gh-pages

.github/workflows/pre-commit.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
     - name: Checkout source repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

.github/workflows/publish-pypi.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout source repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:

.github/workflows/publish-test-pypi.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout source repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:

.github/workflows/pylint.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
     - name: Checkout source repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with: