Bump actions/checkout from 3.0.2 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.0.2 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.0.2...v4.2.1)

---
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

@@ -15,7 +15,7 @@ jobs:
         racket-variant: ["BC", "CS"]
         enable-contracts: [true, false]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v4.2.1
       - uses: Bogdanp/[email protected]
         with:
           architecture: x64

.github/workflows/resyntax-analyze.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v4.2.1
         # See https://github.com/actions/checkout/issues/118.
         with:
           fetch-depth: 0

.github/workflows/resyntax-autofixer.yml

@@ -15,7 +15,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3.0.2
+        uses: actions/checkout@v4.2.1
       - name: Install Racket
         uses: Bogdanp/[email protected]
         with:

.github/workflows/resyntax-submit-review.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v4.2.1
       - name: Download Resyntax analysis
         # This uses a github script instead of the download-artifact action because
         # that action doesn't work for artifacts uploaded by other workflows. See