Bump actions/checkout from 3 to 4 (#332)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [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...v4)

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

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

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
   fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust (nightly)
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
@@ -26,7 +26,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
@@ -40,12 +40,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout ${{ github.base_ref }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.base_ref }}
 
       - name: checkout ${{ github.head_ref }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Rust (nightly)
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0