Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/sponsors.yaml

@@ -11,7 +11,7 @@ jobs:
     if: (github.event_name == 'schedule' && github.repository == 'ChrisTitusTech/winutil') || (github.event_name != 'schedule')
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Generate Sponsors 💖
         uses: JamesIves/github-sponsors-readme-action@v1