Fix lint and try to get type stubs installed

Author: markstory

python/mypy.ini

@@ -4,7 +4,6 @@ python_version = 3.11
 [mypy-setuptools]
 ignore_missing_imports = True
 
-
 [mypy-rapidjson]
 ignore_missing_imports = True
 

python/requirements-test.txt

@@ -6,5 +6,4 @@ pytest>=7.2.0
 pytest-xdist==3.2.0
 fastjsonschema==2.16.3
 jsonschema==4.17.3
-types-protobuf==5.27.0.20240626
-mypy-protobuf==3.6.0
+types-protobuf

python/tests/test_codecs.py

@@ -5,7 +5,7 @@
 
 import pytest
 from google.protobuf.timestamp_pb2 import Timestamp
-from sentry_kafka_schemas.codecs import Codec, ValidationError
+from sentry_kafka_schemas.codecs import Codec
 from sentry_kafka_schemas.codecs.json import JsonCodec
 from sentry_kafka_schemas.codecs.msgpack import MsgpackCodec
 from sentry_kafka_schemas.codecs.protobuf import ProtobufCodec