Upgrade snowflake-sdk from 2.2.0 to 2.3.6, and update the version pinning from "^2.2.0" to "^2.3.6".

Version 2.3.6 of the snowflake-connector-nodejs library was released on 2026-03-25 and includes a needed new feature:
* Added support for every authenticator type (including external browser and Okta) in connect(), matching connectAsync().

In the SnowflakeDriverOptions interface, indicate password is optional.

In the prepareConnectOptions function, add a branch to set config attributes when authenticator is EXTERNALBROWSER.