CLA Assistant does not post checklist comment for contributors to sign CLA

Hi team 👋

I’m opening this issue because the CLA Assistant check is failing, but the bot does not post the comment that allows the contributor to accept the CLA.

## PR

https://github.com/w3f/Grants-Program/pull/2763

## Current behavior

* The CLA Assistant check fails.
* No comment is posted in the PR to sign the CLA.
