Bump reactor-core from 3.4.7 to 3.4.8

[dependabot]

Bumps reactor-core from 3.4.7 to 3.4.8.

Release notes

Sourced from reactor-core's releases.

v3.4.8

Reactor-Core 3.4.8 is part of 2020.0.9 Release Train (Europium SR9).

This service release contains bugfixes and new features.

⚠️ Update considerations and deprecations

• Flux#mergeOrdered has been deprecated (#2719)
  • this is because unlike other merge operators it would default to delaying errors
  • instead, mergeComparing has been introduced as an alternative that is more consistent with other merge operators

✨ New features and improvements

• Add mergeComparing as fail-fast alternative to mergeOrdered (complemented with a delayError variant) (#2719)
• Add Mono.cacheInvalidateIf and Mono.cacheInvalidateWhen (#2717)
  • these two new flavors of caching allow to invalidate the value inside the cache by respectively applying a Predicate on the value when a late subscriber comes in or by associating the cached value with a Mono<Void> invalidation trigger that can be externally completed

🪲 Bug fixes

• Have groupBy replenish prefetch amount when last inner cancels (#2737)

📖 Documentation, Tests and Build

• [build] Parallelize slow tests in release workflow (2da73e964)
• [chores] The copyright headers have been updated, finally taking the Pivotal acquisition by VMware into account (#2722, #2725, #2729, #2732, #2734)
• [polish] Tag 3min worth of tests as 'slow' (#2738)

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

@​koldat

Commits

• c4c2967 [release] Fixed: Prepare and release 3.4.8
• 2da73e9 [build] Parallelize slow tests in release workflow
• 00fd209 Temporary back to snapshot, fix a couple flaky tests
• 80e952c [release] Prepare and release 3.4.8
• 53f4648 Add Mono.cacheInvalidate[If|When] (#2717)
• 2d4b522 Have groupBy replenish prefetch amount when last inner cancels (#2737)
• fd14969 Merge #2738 into 3.4.8
• 5e979bb [polish] Tag 3min worth of tests as 'slow' (#2738)
• 409a5cf Add mergeComparing as fail-fast alternative to mergeOrdered (#2719)
• 2e7ec6d [chores] Polish #2732 and fix start years of new files in 3.4.x (#2734)
• Additional commits viewable in compare view

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