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

Author: renovate[bot]

.github/workflows/deploy-docs.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v5

.github/workflows/python-package.yml

@@ -19,7 +19,7 @@ jobs:
         python-version: ["3.11", "3.12", "3.13"]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install uv
       uses: astral-sh/setup-uv@v7
       with:

.github/workflows/python-publish.yml

@@ -34,7 +34,7 @@ jobs:
       # url: https://pypi.org/project/YOURPROJECT/${{ github.event.release.name }}
 
     steps:
-       - uses: actions/checkout@v5
+       - uses: actions/checkout@v6
        - name: Install uv
          uses: astral-sh/setup-uv@v7
          with: