Only updates main airbyte sources on startup

[thomas-gerber]

Description

We update the sources we use in the CLI
We do NOT update the other sources at startup, those will use the version specified in the airbyte config, and the binaries will be downloaded when source config is saved.

Tradeoff is faster start, but we will need to regularly update versions for other connectors in our airbyte config.

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 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?