Update dependency io.reactivex.rxjava3:rxjava to v3.1.6

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This PR contains the following updates:

Package	Type	Update	Change
io.reactivex.rxjava3:rxjava	dependencies	patch	3.1.5 -> 3.1.6

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Release Notes

ReactiveX/RxJava

v3.1.6

Maven
JavaDocs

API changes

• Add an overload to throttleLatest operator with an onDropped callback. (#​7457)
• Add an overload to throttleFirst operator with an onDropped callback. (#​7482)
• Add an overload to throttleLast operator with an onDropped callback. (#​7488)
• Add an overload to throttleWithTimeout operator with an onDropped callback. (#​7510)

Bugfixes

• Fix a race condition in Single.timeout that prevented the timeout signal from happening. (#​7515)

Documentation

• Fix formatting in TestObserver/Consumer/Subscriber javadoc html. (#​7442)
• Fix typo in BehaviorSubject.java. (#​7452)
• Fix grammar about cancellation in Schedulers javadoc. (#​7453)
• Change @coded tag to @code tag. (#​7463)
• Fix fromCompletionStage javadoc. (#​7508)

Other

• Add missing @NonNull annotation to Maybe type argument. (#​7436)
• Remove redundant interface declarations. (#​7438)
• Standardize MissingBackpressureException message, introduce QueueOverflowException. (#​7459)
• Update Flowable.throttleLatest MissingBackpressureException message. (#​7460)
• Fix cancellation order in throttleFirst. (#​7484)

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