Update dependency io.reactivex.rxjava3:rxjava to v3.1.5

[slack-oss-bot]

This PR contains the following updates:

Package	Update	Change
io.reactivex.rxjava3:rxjava	patch	3.1.4 -> 3.1.5

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Release Notes

ReactiveX/RxJava

v3.1.5

Maven
JavaDocs

Dependencies

• Upgrade to Reactive Streams 1.0.4 (#​7424)

Other

• Remove @NonNull return anotations from void methods (#​7425)

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Configuration

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