Bump actions/checkout from 3 to 4 (#3171)

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/checks.yml

@@ -13,7 +13,7 @@ jobs:
     name: "Check & Clippy"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Cache cargo registry
         uses: actions/cache@v3
@@ -51,7 +51,7 @@ jobs:
     name: "Documentation"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
@@ -66,7 +66,7 @@ jobs:
     runs-on: ubuntu-latest
     name: "Formatting"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions-rs/toolchain@v1
         with:
@@ -84,7 +84,7 @@ jobs:
     runs-on: ubuntu-latest
     name: "codegen"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Cache cargo registry
         uses: actions/cache@v3