chore(deps): update dependency astral-sh/uv to v0.9.21

Author: renovate[bot]

.github/workflows/pylint.yml

@@ -28,7 +28,7 @@ jobs:
       with:
         save-cache: ${{ github.ref == 'refs/heads/main' }}
         cache-suffix: ${{ steps.setup_python.outputs.python-version }}
-        version: 0.9.20
+        version: 0.9.21
     - name: Install deps
       run: uv sync --no-binary-package lxml --no-binary-package xmlsec --all-extras --group pylint
     - name: Run pylint