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/build-kernel-a12.yml

@@ -67,7 +67,7 @@ jobs:
       - name: Download artifacts
         uses: actions/download-artifact@v3
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           path: KernelSU
           fetch-depth: 0