Fix 422 error during provisioning of Circle CI source

[thomas-gerber]

Description

Adjust circle CI source config for breaking change in spec.
Breaking changes on the source were introduced this PR.

Type of change

(Delete what does not apply)

• Bug fix (non-breaking change which fixes an issue)

Checklist

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• Have you checked if 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?

[thomas-gerber]

@willmarks do you know what happens for existing CE users that use Circle CI and that update the source? How is the spec change handled Airbyte-side?

[thomas-gerber]

I think we were somewhat lucky the PR integration tests worked with the current bad image, because GitHub was provisioned successfully before the 422, and the integration test is on GitHub data.