Bump actions/checkout from 1 to 6 (#1637)

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v1...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/pull_request.yml

@@ -31,7 +31,7 @@ jobs:
     container: swiftlang/swift:nightly-main-noble
     steps:
       - name: Checkout Sources
-        uses: actions/checkout@v1
+        uses: actions/checkout@v6
       - name: Install Dependencies
         shell: bash
         run: apt update && apt install -y cmake ninja-build