build(deps): bump org.jctools:jctools-core from 4.0.4 to 4.0.6

[dependabot]

Bumps org.jctools:jctools-core from 4.0.4 to 4.0.6.

Release notes

Sourced from org.jctools:jctools-core's releases.

Add VarHandle queues and other minor fixups

NOTE: This will be the last release with JDK6 bytecode for jctools-core. The next release will be 5.0.0 and will compile with the 1.8 target, allowing for method handles.

This release has 2 artifacts. The old jctools-core with the following changes:

• Where plain access to field is used by queues, the field is not volatile and volatile access is done using Unsafe.
• Use a generated ConcurrentCircularXXXQueue instead of hand rolled base classes in generated code.
• Padding blocks formatting is improved in generated code.

The release introduces a new artifact, jctools-core-jdk11 which included generated VarHandle queues (padded and unpadded). These queues do not rely on Unsafe, and offer better performance than the AtomicFieldUpdater generated code. We expect many users will prefer these variants going forward to break their reliance on Unsafe.

The majority of the VarHandle work is a great contribution from @​amarziali , thanks!!! We also thank @​franz1981 for his help reviewing and profiling the code.

Fix bytecode version and add unpadded atomic queues

No release notes provided.

Commits

• 81fc9f7 Add VH package info
• b43fb9a Remove la optimization from VH queues in the absence of evidence it improve...
• b8b6eb5 Improve baseline
• e06b852 Generate atomic queues after builder changes
• 97aa7b4 Prep atomic generator for generating base classes
• e17024a Generate VH LinkedArray queues
• 85f8938 Regenerate queues with padding block
• 845e8ff Fix up volatile/plain fields access and prep for LinkedArray queues
• dc94426 Nicer formatting for padding blocks
• 7c77981 Fix test timeout due to slow clear on linked queues
• Additional commits viewable in compare view

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