chore(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/CICD.yml

@@ -12,7 +12,7 @@ jobs:
   cheap_checks:
     runs-on: 'ubuntu-latest'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v5
@@ -35,7 +35,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       # Initial Setup
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v5
@@ -80,7 +80,7 @@ jobs:
     needs: ci
     if: endsWith(github.ref, 'heads/release') && (github.event_name == 'push')
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Release
         uses: softprops/action-gh-release@v2
         if: startsWith(github.ref, 'refs/tags/')

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Black
         uses: psf/black@stable
       - name: Set up Python environment