Bump ext/Avalonia from 4e30256 to 8b60a94 (#59)

Bumps [ext/Avalonia](https://github.com/AvaloniaUI/Avalonia) from `4e30256` to `8b60a94`.
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@4e30256...8b60a94)

---
updated-dependencies:
- dependency-name: ext/Avalonia
  dependency-version: 8b60a941a12784e11aa93d97ef5aba1e3ad12c50
  dependency-type: direct:production
...

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

Author: dependabot[bot]