ci: use the same command line as in docs

Author: hynek

.github/workflows/ci.yml

@@ -203,8 +203,7 @@ jobs:
           persist-credentials: false
       - uses: hynek/setup-cached-uv@757bedc3f972eb7227a1aa657651f15a8527c817 # v2.3.0
 
-      - run: uv venv --python $(cat .python-version-default)
-      - run: uv sync --dev
+      - run: uv sync --python $(cat .python-version-default)
 
       - name: Ensure we can import attr and attrs packages
         run: |