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](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>

.github/workflows/codeql.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     name: "Create Release"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Is pre-release?
         id: is_pre_release

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
           - 'ubuntu-latest'
           - 'macos-latest'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # NB: We have a Docker setup for testing -- why do all this?
       #     Because we want to confirm it runs on macOS, and