chore(deps): update dependency google-cloud-datastore to v2.4.0 (#288)

Author: renovate-bot

dlp/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-dlp==3.3.1
 google-cloud-storage==1.42.3
 google-cloud-pubsub==2.8.0
-google-cloud-datastore==2.3.0
+google-cloud-datastore==2.4.0
 google-cloud-bigquery==2.30.1