fix(deps): update dependency rxjs to v6.6.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rxjs (source)	6.6.3 -> 6.6.7

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Release Notes

reactivex/rxjs (rxjs)

### [`v6.6.7`](https://togithub.com/reactivex/rxjs/compare/6.6.6...6.6.7) [Compare Source](https://togithub.com/reactivex/rxjs/compare/6.6.6...6.6.7) ### [`v6.6.6`](https://togithub.com/reactivex/rxjs/compare/6.6.4...6.6.6) [Compare Source](https://togithub.com/reactivex/rxjs/compare/6.6.4...6.6.6) ### [`v6.6.4`](https://togithub.com/reactivex/rxjs/compare/6.6.3...6.6.4) [Compare Source](https://togithub.com/reactivex/rxjs/compare/6.6.3...6.6.4)

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