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/CICD.yml

@@ -12,7 +12,7 @@ jobs:
   cheap_checks:
     runs-on: 'ubuntu-latest'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Python setup
       - uses: actions/setup-python@v4
@@ -54,7 +54,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       # Initial Setup
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Documentation setup
       - name: Setup Quarto
@@ -98,7 +98,7 @@ jobs:
     needs: ci
     if: endsWith(github.ref, 'heads/release') && (github.event_name == 'push')
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Release
         uses: softprops/action-gh-release@v1
         if: startsWith(github.ref, 'refs/tags/')

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Black
         uses: psf/black@stable
       - name: Set up Python environment