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/ci.yml

@@ -22,7 +22,7 @@ jobs:
           gem --version
 
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # https://github.com/ruby/setup-ruby
       - name: ruby setup

.github/workflows/danger.yml

@@ -18,7 +18,7 @@ jobs:
           gem --version
 
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # https://github.com/ruby/setup-ruby
       - name: ruby setup

.github/workflows/link-checker.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # https://github.com/marketplace/actions/markdown-link-check
       - name: markdown-link-check

.github/workflows/new-issue-pr.yml

@@ -28,7 +28,7 @@ jobs:
           gem --version
 
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.DANGER_GITHUB_API_TOKEN }}
 

.github/workflows/optimize-images.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.DANGER_GITHUB_API_TOKEN }}
           fetch-depth: 0
@@ -46,7 +46,7 @@ jobs:
     runs-on: macOS-latest
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.DANGER_GITHUB_API_TOKEN }}
           ref: ${{ github.event.pull_request.head.ref }}