fix(deps): require protobuf <4.0.0dev (#456)

Author: parthea

setup.py

@@ -28,7 +28,8 @@
  # Until this issue is closed
  # https://github.com/googleapis/google-cloud-python/issues/10566
  "google-api-core[grpc] >= 1.31.5, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.0",
- "proto-plus >= 1.18.0",
+ "proto-plus >= 1.18.0, <2.0.0dev",
+ "protobuf >= 3.19.0, <4.0.0dev",
 ]
 extras = {
  "pandas": ["pandas>=0.21.1"],

testing/constraints-3.6.txt

@@ -11,3 +11,4 @@ libcst==0.2.5
 fastavro==0.21.2
 pandas==0.21.1
 pyarrow==0.15.0
+protobuf==3.19.0