Update min proto version and fix gRPC optional dependency (#231)

Author: cretz

poetry.lock

@@ -28,7 +28,7 @@ script = "build.py"
 grpcio = { version = "^1.48.0", optional = true }
 opentelemetry-api = { version = "^1.11.1", optional = true }
 opentelemetry-sdk = { version = "^1.11.1", optional = true }
-protobuf = ">=3.19"
+protobuf = ">=3.20"
 python = "^3.7"
 python-dateutil = { version = "^2.8.2", python = "<3.11" }
 types-protobuf = "~3.20"
@@ -58,7 +58,7 @@ twine = "^4.0.1"
 
 [tool.poetry.extras]
 opentelemetry = ["opentelemetry-api", "opentelemetry-sdk"]
-grpc = ["grpc"]
+grpc = ["grpcio"]
 
 [tool.poe.tasks]
 build-develop = "python scripts/setup_bridge.py develop"