chore(deps): bump actions/checkout in the github-actions group

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 2 to 4
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

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

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - uses: swatinem/rust-cache@v2
       - name: cargo fmt
@@ -54,7 +54,7 @@ jobs:
           - "beta"
           - "nightly"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.channel }}
@@ -67,7 +67,7 @@ jobs:
   check-deps:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - uses: swatinem/rust-cache@v2
       - name: cargo check