Bump actions/checkout from 2 to 4 (#1)

Bumps [actions/checkout](https://github.com/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
...

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

.github/workflows/ci.yml

@@ -91,7 +91,7 @@ jobs:
     env:
       DEVELOPER_DIR: /Applications/Xcode_14.1.app/Contents/Developer
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Discover typos
         run: |
           export PATH="$PATH:/Library/Frameworks/Python.framework/Versions/3.11/bin"

.github/workflows/danger.yml

@@ -18,7 +18,7 @@ jobs:
           ruby-version: 3.1.4
           bundler-cache: true
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Setup gems
         run: |
           gem install bundler