fix: Update .gitpod.yml to support Gitpod's current configuration

[darshanlahamage]

Proposed changes (including videos or screenshots)

This PR updates the .gitpod.yml file to align with Gitpod documentation and Rocket.Chat gitpod setup instructions.

Issue(s)

Fixes : #34487

Steps to test or reproduce

Further comments

gitpod setup instructions - https://developer.rocket.chat/docs/gitpod

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is targeting the wrong base branch. It should target 7.3.0, but it targets 7.2.0

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