Merge pull request #4461 from typelevel/update/flake-lock

flake.lock: Update

Merge pull request #4449 from durban/fixSpinlock

Fix the spinlock from #4377 and probably also fix #4448

Merge pull request #4432 from djspiewak/build/sonatype

Merge pull request #4343 from CJSmith-0141/on_error_package_private

Make deprecated `IO.onError` package private

Merge pull request #4307 from iRevive/fix/poller-metrics

SelectorSystem - properly record operation metrics

Merge pull request #4263 from kapunga/4254-custom-non-fatal

Create `UnsafeNonFatal` for use in the fiber runtime

Tagging v3.6.0-RC1

Merge pull request #4167 from kamilkloch/unsafe-run-sync-interrupt

Propagate Java thread interruption in `Dispatcher#unsafeRunSync`

Merge pull request #4160 from lenguyenthanh/patch-1

Fix joinWithNever docs

Merge pull request #4153 from mzuehlke/series-3.5x/graalvm21

Update GraalVM from 17 to 21