Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build-linux.yml

@@ -228,7 +228,7 @@ jobs:
 
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         submodules: recursive
         fetch-depth: 0
@@ -273,7 +273,7 @@ jobs:
       DOCKER_IMAGE: ghcr.io/fedora-remix-loongarch/mini-image:f43
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         submodules: recursive
         fetch-depth: 0