Bump actions/checkout from 4.1.2 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.2 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.2...v4.2.1)

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

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

.github/workflows/coverage.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.1.2
+        uses: actions/checkout@v4.2.1
 
       - name: Install rust
         uses: actions-rs/toolchain@v1

.github/workflows/standard.yml

@@ -16,7 +16,7 @@ jobs:
           - nightly
 
     steps:
-      - uses: actions/checkout@v4.1.2
+      - uses: actions/checkout@v4.2.1
 
       - uses: actions-rs/toolchain@v1.0.7
         with: