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

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rxjs	>=6.6.6 -> >=6.6.7
rxjs	^6.6.6 -> ^6.6.7

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Release Notes

reactivex/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)

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