Switches back to community GitHub source

[thomas-gerber]

Description

Tests indicate it is MUCH faster than our fork now.
pull_requests_stats stream is now disabled by default (slow).
CLI does not need to be updated as sourceId is left unchanged.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist

(Delete what does not apply)

• Have you checked to there aren't other open Pull Requests for the same update/change?
• Have you lint your code locally before submission?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?