Bump trayicon from 0.3.0 to 0.4.0 (#27)

Bumps [trayicon](https://github.com/ciantic/trayicon-rs) from 0.3.0 to 0.4.0.
- [Commits](https://github.com/ciantic/trayicon-rs/commits)

---
updated-dependencies:
- dependency-name: trayicon
  dependency-version: 0.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]