Stopped jira source auto-update

[thomas-gerber]

Description

Problem around Epics stream introduced in 0.3.1.
airbytehq/airbyte#20128

Type of change

Checklist

(Delete what does not apply)

• Have you checked to there aren't other open Pull Requests for the same update/change?
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• Have you successfully run tests with your changes locally?

[thomas-gerber]

For completeness, even though our config says 0.3.0, the actual version is 0.2.20 which is the one pegged to the existing airbyte version we are currently running (it is somewhere in the airbyte code, @cjwooo showed me once. And while this is confusing, I don't think we can remove that part of the standard source definition (I think I tried before).