build(deps): bump actions/checkout from 5 to 6 (#382)

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/deploy.yml

@@ -16,7 +16,7 @@ jobs:
       SETUPTOOLS_SCM_PRETEND_VERSION: ${{ github.event.inputs.version }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Build and Check Package
       uses: hynek/[email protected]
@@ -30,7 +30,7 @@ jobs:
       contents: write  # For tag.
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Download Package
       uses: actions/download-artifact@v6

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
   package:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Build and Check Package
       uses: hynek/[email protected]
 
@@ -37,7 +37,7 @@ jobs:
         python: [ "3.10", "3.11", "3.12", "3.13", "3.14", "pypy-3.11" ]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0