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

Author: renovate[bot]

.github/workflows/docs.yaml

@@ -11,7 +11,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: NiklasRosenstein/slap@gha/install/v1
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/develop'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/download-artifact@v6
         with: { name: docs, path: docs/site }
       - uses: JamesIves/github-pages-deploy-action@v4.7.3

.github/workflows/python.yml

@@ -122,7 +122,7 @@ jobs:
             # "pypy-3.11",
           ]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -141,7 +141,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/') && github.event_name == 'push'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7