Use uv sync.

Author: adamghill

.readthedocs.yml

@@ -18,7 +18,7 @@ build:
       - uv venv $READTHEDOCS_VIRTUALENV_PATH
     install:
       # Use a cache dir in the same mount to halve the install time
-      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH uv pip install --cache-dir $READTHEDOCS_VIRTUALENV_PATH/../../uv_cache .[docs]
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH uv sync --cache-dir $READTHEDOCS_VIRTUALENV_PATH/../../uv_cache --group docs
     build:
       html:
         - uv run sphinx-build -T -b html docs/source $READTHEDOCS_OUTPUT/html