Allow protobuf 7.x

[parthea]

Protobuf 7.34.0 was released last week https://pypi.org/project/protobuf/7.34.0/

All packages should be updated to allow Protobuf 7.x https://pypi.org/project/protobuf/7.34.0/

[daniel-sanche]

This has been merged in the generator, so the next step should be do do a gapic update