Bump actions/checkout from 3 to 4

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](actions/checkout@v3...v4)

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

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

.github/workflows/test.yaml

@@ -5,7 +5,7 @@ jobs:
   unit-test:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: raviqqe/enable-homebrew@main
       - run: tools/ci/setup.sh
       - run: cargo test
@@ -14,7 +14,7 @@ jobs:
   integration-test:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: raviqqe/enable-homebrew@main
       - run: tools/ci/setup.sh
       - uses: ruby/setup-ruby@v1
@@ -24,19 +24,19 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: cargo fmt -- --check
   lint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: raviqqe/enable-homebrew@main
       - run: tools/ci/setup.sh
       - run: cargo clippy -- -D warnings
   spell-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: streetsidesoftware/cspell-action@main
         with:
           files: "**/*.{feature,md,rs}"