Bump actions/checkout from 5 to 6 (#141)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
     - name: Get source code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - uses: actions/setup-python@v6
       with:

.github/workflows/tests.yml

@@ -43,7 +43,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-tags: true
 

.github/workflows/wheel.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Get source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Fetch all history for tags
 

.github/workflows/windows-tests.yml

@@ -24,7 +24,7 @@ jobs:
       PGSYSCONFDIR: .
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6