build(deps): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
@@ -26,7 +26,7 @@ jobs:
         python: ['3.10', '3.11', '3.12', '3.13', '3.14']
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v5
         with:
@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Python
@@ -68,7 +68,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Python