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

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>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -6,31 +6,31 @@ jobs:
   python-tableone:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build and check python-tableone
         uses: edlanglois/pkgbuild-action@v1
         with:
           pkgdir: "python-tableone"
   python-kodistubs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build and check python-kodistubs
         uses: edlanglois/pkgbuild-action@v1
         with:
           pkgdir: "python-kodistubs"
   python-cursor:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build and check python-cursor
         uses: edlanglois/pkgbuild-action@v1
         with:
           pkgdir: "python-cursor"
   kodi-addon-checker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build and check kodi-addon-checker
         uses: edlanglois/pkgbuild-action@v1
         with:
@@ -39,7 +39,7 @@ jobs:
   sioyek:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build and check sioyek
         uses: edlanglois/pkgbuild-action@v1
         with:

.github/workflows/check-readme.yml

@@ -6,7 +6,7 @@ jobs:
     build:
         runs-on: ubuntu-latest
         steps:
-        - uses: actions/checkout@v5
+        - uses: actions/checkout@v6
         - name: Set up Python 3.8
           uses: actions/setup-python@v6
           with: