tests: Exclude GRPC version that was causing a hang (#857)

Author: rwhogg

packages/google-cloud-ndb/noxfile.py

@@ -180,9 +180,9 @@ def system(session):
         session.skip("System tests were not found")
 
     # Use pre-release gRPC for system tests.
-    # Exclude version 1.49.0rc1 which has a known issue.
-    # See https://github.com/grpc/grpc/pull/30642.
-    session.install("--pre", "grpcio!=1.49.0rc1")
+    # Exclude version 1.52.0rc1 which has a known issue.
+    # See https://github.com/grpc/grpc/issues/32163.
+    session.install("--pre", "grpcio!=1.52.0rc1")
 
     # Install all test dependencies, then install this package into the
     # virtualenv's dist-packages.