fix(deps): update dependency io.reactivex.rxjava3:rxjava to v3.1.12

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.reactivex.rxjava3:rxjava	3.1.9 → 3.1.12

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Release Notes

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

v3.1.12

Version 3.1.12 - September 24, 2025

Bugfixes

• Fix for the empty module version string in the module-info.class file. #​7906

v3.1.11

Version 3.1.11 - July 7, 2025

Maven
JavaDocs

Bugfixes

• Fix ReplaySubject termination-subscription race emitting wrongly. #​7879

v3.1.10

Compare Source

Version 3.1.10 - November 26, 2024

Maven
JavaDocs

Bugfixes

• Fix GC nepotism with MpscLinkedQueue's poll logic. #​7799
• Fix FlowableBlockingIterable.onNext to set the exception before terminating to avoid losing it. #​7789

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