chore(deps): update dependency io.projectreactor:reactor-test to v3.4.19

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.projectreactor:reactor-test	3.4.18 -> 3.4.19

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Release Notes

reactor/reactor-core

v3.4.19

Reactor-Core 3.4.19 is part of 2020.0.20 Release Train (Europium SR20).

What's Changed

✨ New features and improvements

• Add key hook parts to Schedulers.onHandleError by @​simonbasle in #​3039
• [reactor-test] Add StepVerifier option to use ConditionalSubscriber by @​simonbasle in #​3035
• Introduce an alternative to Processor-with-upstream case by @​simonbasle in #​3042
• Rework Processor-with-upstream case to be backward compatible by @​simonbasle in #​3065
• Implement variant of windowTimeout with fairBackpressure by @​OlegDokuka in #​3054
  • This is activated by the fairBackpressure boolean parameter.

🐞 Bug fixes

• Fix DoOnEach ASYNC fusion triggering onNext signal twice by @​simonbasle in #​3045
• Fix cancel too synchronized in MonoCollect[List] by @​simonbasle in #​3053
• Async fusion bug: extra fixes and changes by @​simonbasle in #​3046

📖 Documentation, Tests and Build

• Introducing JCStress tests for concurrent queues by @​chemicL in #​3069

🆙 Dependency Upgrades

• June dependency upgrades by @​simonbasle in #​3066
• Update Reactive-Streams to v1.0.4 by @​renovate-bot in #​3055
• Update plugin bnd to v6.3.1 by @​simonbasle in #​3070

New Contributors

• @​chemicL made their first contribution in #​3069

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Configuration

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