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fix(mergeMap): fix nested mergeMaps (#4072)

* test(mergeMap): add failing tests

https://github.com/ReactiveX/rxjs/issues/4071

* fix(mergeMap): fix nested mergeMaps

Don't add self as parent.
Closes #4071

* chore(package): update lock file for dtslint

* test(mergeMap): use micro tasks

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