[ci] fix linkchecker job

.ci/test.sh

@@ -147,7 +147,7 @@ if [[ $TASK == "check-docs" ]] || [[ $TASK == "check-links" ]]; then
     if [[ $TASK == "check-links" ]]; then
         # check docs for broken links
         pip install linkchecker
-        linkchecker --config=.linkcheckerrc ./docs/_build/html/*.html || exit 1
+        linkchecker --config=./docs/.linkcheckerrc ./docs/_build/html/*.html || exit 1
         exit 0
     fi
     # check the consistency of parameters' descriptions and other stuff