AwssqsSource now uses sources.knative.dev

[lberk]

Previously the source used sources.eventing.knative.dev and has been moved to sources.knative.dev

No other functional changes

[lionelvillard]

/assign @lberk

[lberk]

Looks like @ellenevans got to this with #2268 (thanks!)

/close

[knative-prow-robot]

@lberk: Closing this issue.

In response to this:

Looks like @ellenevans got to this with #2268 (thanks!)

/close

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