Bump actions/checkout from 3.3.0 to 3.4.0 (#50)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.3.0 to 3.4.0.
- [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/v3.3.0...v3.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/coverage.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3.3.0
+      - uses: actions/checkout@v3.4.0
         with:
           persist-credentials: false
 

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     name: test on MSRV
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3.3.0
+    - uses: actions/checkout@v3.4.0
     - uses: actions-rs/toolchain@v1.0.7
       with:
         # When toolchain is not specified, it uses rust-toolchain, which is the MSRV
@@ -20,7 +20,7 @@ jobs:
     name: test on nightly
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3.3.0
+    - uses: actions/checkout@v3.4.0
     # Because we use nightly features for building docs,
     # using --all-features will fail without nightly toolchain.
     - uses: actions-rs/toolchain@v1.0.7
@@ -35,7 +35,7 @@ jobs:
     name: build with no_std
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3.3.0
+    - uses: actions/checkout@v3.4.0
     - uses: actions-rs/toolchain@v1.0.7
       with:
         toolchain: stable