[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

stack/lab/Dockerfile

@@ -112,4 +112,4 @@ USER ${NB_USER}
 
 WORKDIR "/home/${NB_USER}"
 
-RUN  mkdir -p /home/${NB_USER}/apps
+RUN  mkdir -p /home/${NB_USER}/apps