build(deps): bump desktop_multi_window from 0.2.1 to 0.3.0 (#136)

Bumps [desktop_multi_window](https://github.com/MixinNetwork/flutter-plugins/tree/main/packages) from 0.2.1 to 0.3.0.
- [Release notes](https://github.com/MixinNetwork/flutter-plugins/releases)
- [Commits](https://github.com/MixinNetwork/flutter-plugins/commits/HEAD/packages)

---
updated-dependencies:
- dependency-name: desktop_multi_window
  dependency-version: 0.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pubspec.yaml

@@ -63,7 +63,7 @@ dependencies:
   re_highlight: ^0.0.3
   shelf: ^1.4.2
   qr_flutter: ^4.1.0
-  desktop_multi_window: ^0.2.1
+  desktop_multi_window: ^0.3.0
   watcher: ^1.1.4
   path: ^1.9.1
   crypto: ^3.0.6