Consider renaming the io_bazel_rules_kotlin dependency to rules_kotlin

[Kernald]

This is now the recommended name to use (https://github.com/bazelbuild/rules_kotlin/issues/1065), and not using it means anyone using the new name has to declare an alias to avoid grpc-kotlin loading its own version: https://github.com/grpc/grpc-kotlin/blob/253c24f5801446dbe142c7e1b7a1716b841dc238/repositories.bzl#L31

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