chore(deps): update dependency rxjs to v6.5.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rxjs	dependencies	patch	6.5.3 -> 6.5.4

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Release Notes

reactivex/rxjs

### [`v6.5.4`](https://togithub.com/reactivex/rxjs/compare/6.5.3...6.5.4) [Compare Source](https://togithub.com/reactivex/rxjs/compare/6.5.3...6.5.4)

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