Updating and releasing artman with the following changes:
bumping gapic-generator version to 2.4.3
updating versions of protoc for all languages to 3.12.x
passing --experimental_allow_proto3_optional to protoc invocations
updating Go version (to fix a build problem)
update gRPC tools for Python and Ruby to match the new protoc version (cc: @software-dov and @busunkim96 for Python, @viacheslav-rostovtsev and @dazuma for Ruby)
bumping artman version to 2.4.3 to match gapic-generator version.
Updating and releasing
artmanwith the following changes:protocfor all languages to 3.12.x--experimental_allow_proto3_optionaltoprotocinvocationsprotocversion (cc: @software-dov and @busunkim96 for Python, @viacheslav-rostovtsev and @dazuma for Ruby)artmanversion to 2.4.3 to match gapic-generator version.