Update dependency io.reactivex.rxjava3:rxjava to v3.1.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.reactivex.rxjava3:rxjava	3.1.8 -> 3.1.9

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Release Notes

ReactiveX/RxJava (io.reactivex.rxjava3:rxjava)

v3.1.9

Maven
JavaDocs

Bugfixes

• Fix ScheduledRunnable's interruption logic if used from a no-interrupt Schedulers.from. #​7745

Documentation

• Update the javadoc description of cast(). #​7606
• Update How-To-Use-RxJava.md (ReactiveX/RxJava@d0038c9, ReactiveX/RxJava@6d63111)
• Update Readme.md with reference to JavaFXScheduler.platform. (ReactiveX/RxJava@f822ffb)
• Fix broken annotation links. #​7652
• Update marbles for concatMap{Single|Maybe}[DelayError] #​7698

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