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

Author: renovate[bot]

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: astral-sh/setup-uv@v5
     - name: Build wheel
       run: uv build

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
           - version: "3.13"
           - version: '3.14.0-alpha - 3.14' # SemVer's version range syntax
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install uv
         uses: astral-sh/setup-uv@v5
         with: