Version 10.0.0 changelog in progress

[mbax]

This issue may be fully deleted when I release. Using this to track the changes as I smash and break things

No major fixes, just API/impl improvements.

Breaking changes:

• Updated to Java 21
  • Android apps can use the clearly stable 9.0.
• Changed CapabilityManager's Defaults from being transient to having a @Conditional annotation to mark them not being automatically requested.
• Removed any @Deprecated methods present in 9.0.
• No longer offering a shaded classifier. It's 2025 - we can all use build tools properly now!
• Removed clunky initialize method from Client - only relevant if you actually implemented a custom Client.
• Made CaseMapping an interface

Other changes:

• Updated Netty to 4.1.135.
• Switched to jspecify for nullness annotations.
• Now properly prevents using STS with an insecure trust manager.