Bump actions/checkout from 3 to 4 (#935)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to
4.
- [Release notes](https://github.com/actions/checkout/releases)
-
[Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

.github/workflows/gki-kernel.yml

@@ -80,7 +80,7 @@ jobs:
           remove-haskell: 'true'
           remove-codeql: 'true'
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           path: KernelSU
           fetch-depth: 0