Fix uv install in CI (#311)

Author: nikobockerman

.github/actions/uv-project-setup/action.yaml

@@ -46,7 +46,7 @@ runs:
           echo "::endgroup::"
         done
 
-        first_dir_with_uv=$(echo "$DIRECTORIES" | cut -d ' ' -f 1)
+        first_dir_with_uv=$(echo "$DIRECTORIES" | head -n 1)
         echo "::group::Prune uv cache"
         pushd "$first_dir_with_uv"
         # --ci switch removes build-system dependencies, unless they are pinned to specific version