dbt-language-server dumps non-LSP content to stdio

Hi,

When using with emacs & emacs-lsp-booster, I encountered a problem with the stdio output.

Steps to reproduce:

1. Use google bigquery with dbt
2. Start `dbt-language-server --stdio`

Expected result:
1. Only `lsp` allowed content on stdout

Actual result:
1. zetasql-snowflake outputs this content
```
Running server on localhost:40109...
Server listening on localhost:40109
```
to stdout.

See the related bug here: https://github.com/blahgeek/emacs-lsp-booster/issues/22

Thank you for any help you can provide!