chore(deps): update dependency datalab to v1.2.1 (#8309)

Author: renovate-bot

bigquery/datalab-migration/requirements.txt

@@ -3,6 +3,6 @@ google-cloud-bigquery[pandas,pyarrow]==2.34.4
 # datalab has outdated dependencies that require google-api-core < 2
 # The last version of google-cloud-bigquery-storage that supports google-api-core 1.x is 2.13.2
 google-cloud-bigquery-storage===2.13.2
-datalab==1.2.0
+datalab==1.2.1
 ipython==8.0.1
 pyarrow==6.0.1