doc: add himadriganguly as a triager

I would like to apply for the role of a triager in this project.
My motivation to become a triager is to help manage issues, as well as
learn deeper concepts of Node.js, and eventually become a collaborator!
I hereby declare that I have read and understood the Code of Conduct
and will adhere to that.

PR-URL: https://github.com/nodejs/node/pull/39757


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>