Rename extras (#80)

Author: AdrienVannson

poetry.lock

@@ -18,8 +18,8 @@ Repository = "https://github.com/betterproto/python-betterproto2"
 
 [project.optional-dependencies]
 rust-codec = ["betterproto2-rust-codec"]
-grpc-sync = ["grpcio"]
-grpc-async = ["grpclib"]
+grpcio = ["grpcio"]
+grpclib = ["grpclib"]
 
 # betterproto2-rust-codec is not included because still experimental
 all = ["grpclib", "grpcio"]