Update dependency rxjs to v6.6.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rxjs (source)	6.4.0 -> 6.6.7

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Release Notes

reactivex/rxjs (rxjs)

v6.6.7

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v6.6.6

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v6.6.4

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v6.6.3

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v6.6.2

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v6.6.1

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v6.6.0

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v6.5.5

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v6.5.4

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v6.5.3

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Bug Fixes

• general: Refactor modules so they don't show side effects in some tools (#​4769) (9829c5e0)
• defer: restrict allowed factory types (#​4835) (40a22096)

v6.5.2

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v6.5.1

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Bug Fixes

• Notification: replace const enum (#​4556) (e460eec), closes #​4538
• throttleTime: emit single value with trailing enabled (#​4564) (fd690a6), closes #​2859 #​4491

v6.5.0

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Bug Fixes

• docs-app: remove stopWordFilter from lunr pipeline (#​4536) (9eaebd4)
• dtslint: disable tests that break in TS@next (#​4705) (ecc73d2)
• index: export NotificationKind (#​4514) (7125355), closes #​4513
• race: better typings (#​4643) (fb9bc48), closes #​4390 #​4642
• throwIfEmpty: ensure result is retry-able (c4f44b9)
• types: Fixed signature for onErrorResumeNext (#​4603) (4dd0be0)

Features

• combineLatest: deprecated rest argument and scheduler signatures (#​4641) (6661c79), closes #​4640
• fromFetch: We now export a fromFetch static observable creation method from rxjs/fetch. Mirrors native fetch only it's lazy and cancellable via Observable interface. (#​4702) (5a1ef86)
• forkJoin: accepts a dictionary of sources (#​4640) (b5a2ac9)
• partition: new partition observable creation function. Old partition operator is deprecated (#​4419) (#​4685) (d5d6980)
• scheduled: Add scheduled creation function to use to create scheduled observable of values. Deprecate scheduled versions of from, range, et al. (#​4595) (f57e1fc)

Performance Improvements

• Subscription: improve parent management (#​4526) (06f1a25)

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