Bump reactor-core from 3.4.4 to 3.4.5

[dependabot]

Bumps reactor-core from 3.4.4 to 3.4.5.

Release notes

Sourced from reactor-core's releases.

v3.4.5

Reactor-Core 3.4.5 is part of 2020.0.6 Release Train (Europium SR6).

This service release contains bugfixes and a couple implementation improvements forwarded from the 3.3.x line as well as documentation improvements.

All changes from 3.3.16.RELEASE are also included and these are listed below with an additional level of indentation.

⚠️ Update considerations and deprecations

• from 3.3.x:
  • Remove Fuseable from MonoSingle[Mono|Callable] (#2668)

✨ New features and improvements

• from 3.3.x:
  • MonoDelayUntil now subscribes each trigger from the last trigger (#2644)
  • Make Mono.then execution model more deterministic (#2604)

🪲 Bug fixes

• from 3.3.x:
  • Account for source disconnection in refCountGrace (#2652)
  • Avoid infinite discard loop on fused fromIterable/fromStream (#2655)
  • Fix both Flux.single variants when applied to a Callable (#2657)
  • FluxWindowWhile now drains the inner window if it is cancelled, instead of hanging (#2651)

📖 Documentation, Tests and Build

• Fix buffer constructor error message displaying wrong variable name (#2658)
• Add links to "Which operator do I need?" documentation (#2639)
• Clarify onErrorContinue() caveats and alternatives (#2662)
• from 3.3.x:
  • Removed jcenter() from build
  • Upgraded the release process to stop relying on bintray/jcenter

👍 Thanks to the following contributors that also participated to this release

@​berry120, @​mickeelm, @​underbell

Commits

• 22b5f05 Prepare and release 3.4.5
• 04cdb3c Merge-ignore release 3.3.16.RELEASE into master
• bf033b6 Next development version 3.3.17.BUILD-SNAPSHOT
• e34db9b Trigger release 3.3.16.RELEASE again due to bad setup
• 907109a Prepare and release 3.3.16.RELEASE
• 423f58a Merge #2673 into 3.4.5
• ab0623f GitHub Actions Release Process: Back to single publication (#2673)
• 08b9439 Merge #2670 and d67935f0 into 3.4.5
• d67935f Polish #2670: Use GITHUB_RUN_NUMBER as buildNumber
• 1c4cc1b GitHub Actions Release Process: signing, artifactory, sonatype (#2670)
• Additional commits viewable in compare view

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