v0.7.0

Added:

• (sync): Introduce sync::once event channel (there are still some docs to be added)
• (sync::once): Add dropped, is_dropped, poll_dropped to OnceTrigger
• (sync::once): Fix some bugs, improve unit tests, and complete the doc comments

Improved:

• (task): Update unit test implementation

Deps:

• Upgrade thiserror to 2.0.11
• Upgrade indexmap to 2.7.1

Docs:

• (README): Add sync::once

Full Changelog: v0.6.1...v0.7.0