github-actions: bump actions/checkout from 3 to 4 (#519)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -45,7 +45,7 @@ jobs:
   pretty:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - name: Bootstrap
@@ -68,7 +68,7 @@ jobs:
             gcc_download_url: http://wiki.telink-semi.cn/tools_and_sdk/Tools/IDE/telink_riscv_linux_toolchain.zip
             gcc_extract_dir: telink_riscv_linux_toolchain
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - name: Bootstrap