github-actions(deps): 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](actions/checkout@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>

Author: dependabot[bot]

.github/workflows/RocketModFix.UnityEngine.Redist.yaml

@@ -13,7 +13,7 @@ jobs:
     name: "RocketModFix.UnityEngine.Redist Pack"
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - uses: actions/setup-dotnet@v5
       name: Setup .NET