chore: release v0.6.0

[ros2-rust-release-plz]

🤖 New release

• rclrs: 0.5.1 -> 0.6.0 (✓ API compatible changes)

Changelog

0.6.0 - 2025-10-27

Added

• [breaking] async actions (#503)
• timers API (#480)

Other

• re-add generate_bindings.py script
• Minimal changes for new Action trait (#539)
• Re-export traits from rosidl_runtime_rs (#537)
• Fix use of serde (#538)
• Put use rustflags next to its usage to prevent a build warning. (#526)

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