Revert "build: limit rxjs to 6.2.x due to a defect in 6.3.0 (#12048)"

[alan-agius4]

This reverts commit 7e63dd7.

Verifying that rxjs 6.1.3 doesn't throw an error

[alan-agius4]

Blocked by: ReactiveX/rxjs#4078

[whyvrafvr]

Hi. I've just updated rxjs from 6.2.2 to 6.3.1 and got the error TypeError: sink._addParentTeardownLogic is not a function running a ng serve.

Is this linked with this ticket?

[hansl]

@alan-agius4 I don't think we want to revert this change. Let's talk at the meeting but it's not the first time RxJS breaks us with a minor update. Maybe we could limit versions when publishing but not developing (to avoid people having problems when installing CLI)?

[clydin]

We should also set the minimum version to at least 6.2 as well. This brings in the exception handling fix that forced workaround code throughout the codebase.

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