Bump actions/checkout from 4.1.7 to 4.2.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 to 4.2.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.7...v4.2.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/main.yml

@@ -12,15 +12,15 @@ jobs:
     name: build on MSRV
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4.1.7
+    - uses: actions/checkout@v4.2.0
     - uses: dtolnay/[email protected]
     - run: cargo build --all-features
 
   test_nightly:
     name: test on nightly
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4.1.7
+    - uses: actions/checkout@v4.2.0
     - uses: dtolnay/rust-toolchain@nightly
     # Update dependencies since we commit the lockfile
     - run: cargo update --verbose
@@ -30,7 +30,7 @@ jobs:
     name: build with no_std
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4.1.7
+    - uses: actions/checkout@v4.2.0
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: stable