upgrade to ndb and google-cloud-datastore 2.0! 🎉

https://github.com/googleapis/python-ndb/releases/tag/v2.0.0

requirements.txt

@@ -26,9 +26,9 @@ google-auth==2.6.3
 google-cloud-appengine-logging==1.1.6
 google-cloud-audit-log==0.2.4
 google-cloud-core==2.2.3
-google-cloud-datastore==1.15.4
+google-cloud-datastore==2.7.2
 google-cloud-logging==3.3.0
-google-cloud-ndb==1.12.0
+google-cloud-ndb==2.0.0
 googleapis-common-protos==1.57.0
 grpc-google-iam-v1==0.12.4
 grpcio==1.51.1