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

Author: renovate[bot]

.github/workflows/python-publish.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v5
       with:

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - name: Install dependencies
         run: |
           set -euxo pipefail
@@ -33,7 +33,7 @@ jobs:
           - "3.13.0-alpha - 3.13"
           - "pypy-3.10"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: excitedleigh/[email protected]
       - uses: actions/setup-python@v5
         with: