Issue with blocking::proto_raw::ProtoRawEncoder in Asynchronous Context

[antonmithun-work]

I'm using schema_registry_converter::blocking::proto_raw::ProtoRawEncoder and creating the new decoder in the main function with #[tokio::main()]. However, this throws the error:

Cannot drop a runtime in a context where blocking is not allowed. This happens when a runtime is dropped from within an asynchronous context.

Out of curiosity, what blocking call happens in let encoder = ProtoRawEncoder::new(sr_settings) that causes this error?

FYI, I'm also exploring the async_impl ProtoRawEncoder for this use case.