fix(deps): update dependency rxjs to ~6.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rxjs	dependencies	minor	~6.5.4 -> ~6.6.0

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Release Notes

reactivex/rxjs

### [`v6.6.0`](https://togithub.com/reactivex/rxjs/compare/6.5.5...6.6.0) [Compare Source](https://togithub.com/reactivex/rxjs/compare/6.5.5...6.6.0)

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