chore(deps): update actions/checkout action to v6 (#256)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build-and-test.yml

@@ -18,7 +18,7 @@ jobs:
         - "3.13"
         - "3.14"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/deploy-pypi.yml

@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v2
       with: