3.1.1 release preparations

[akarnokd]

Version 3.1.1 - August 30th, 2021

Maven
JavaDocs

API promotions

• The operator fusion-related interfaces and two atomic queue implementations have been promoted to standard, thus officially supported in the io.reactivex.rxjava3.operators package. (#7320)

Bugfixes

• Specify proper OSGi unique bundle symbolic name of io.reactivex.rxjava3.rxjava. (#7319)
• Fix ExecutorScheduler initializing Schedulers prematurely when using RxJavaPlugins.createExecutorScheduler. (#7323)
• Fix the LamdbaConsumerIntrospection of Completable's lambda-based observer to use the same missing onError indicator as the other types' lambda-based consumers. (#7326)

[akarnokd]

Closing via https://github.com/ReactiveX/RxJava/releases/tag/v3.1.1