to fix error in "Slack Notify on Star" Job under GitHub Actions

[saurabh100ni]

Description

Under GitHub Actions of this repository "Slack Notify on Star" job is failing for which Slack.yaml is to be Updated.

Fix

To fix this issue, update the code of Slack.yaml just by copy/pasting the code from slack.yaml of meshery

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[akhilender-bongirwar]

Hey @saurabh100ni , I would like to work on this issue.

[saurabh100ni]

Go On @akhilender-bongirwar 😎🚀