Fix selector for unread GitHub notifications count

[eandersons]

Pre-flight Checklist

Please ensure you've completed all of the following.

• [x] I have read the Contributing Guidelines for this project.
• [x] I agree to follow the Code of Conduct that this project adheres to.
• [x] I updated the version package Updating

Description of Change

Because of recent changes in GitHub unread notifications count from the bubble next to "Inbox" was not correctly detected, so the selector was updated to fix this.

[vraravam]

@all-contributors please add @eandersons for code

[allcontributors[bot]]

@vraravam

@eandersons already contributed before to code