ci(deps): bump actions/checkout from 5 to 6 (#16)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/black.yml

@@ -12,7 +12,7 @@ jobs:
 
     name: Code Style
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: '3.x'

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     name: Build and Release to PyPI
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6