Bump actions/checkout from 3 to 4 (#6)

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)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
        remove-cached-tools: 'true'
        remove-swapfile: 'true'
     - name: 'Checkout Repo'
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Build Kernel
       run: |
         git clone https://github.com/t2linux/linux-t2-patches.git