Consider renaming the io_bazel_rules_kotlin dependency to rules_kotlin

[Kernald]

This is now the recommended name to use (bazelbuild/rules_kotlin#1065), and not using it means anyone using the new name has to declare an alias to avoid grpc-kotlin loading its own version:

grpc-kotlin/repositories.bzl

Line 31 in 253c24f

if not native.existing_rule("io_bazel_rules_kotlin"):

Another option would be to check for both names in repositories.bzl and create the alias if needed.