chore(deps): update dependency ipython to v7.18.1 (GoogleCloudPlatform#4830)

Author: renovate-bot

bigquery/datalab-migration/requirements.txt

@@ -2,5 +2,6 @@ grpcio==1.32.0
 google-cloud-bigquery[pandas,pyarrow]==2.0.0
 google-cloud-bigquery-storage==2.0.0
 datalab==1.2.0
-ipython==7.13.0
+ipython==7.18.1; python_version > '3.6'
+ipython==7.16.1; python_version < '3.7'
 pyarrow==1.0.1