Bump ext/Avalonia from 8b60a94 to 872c653 (#62)

Bumps [ext/Avalonia](https://github.com/AvaloniaUI/Avalonia) from `8b60a94` to `872c653`.
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@8b60a94...872c653)

---
updated-dependencies:
- dependency-name: ext/Avalonia
  dependency-version: 872c653b4d17b974dc6d507ead86211cf1f56307
  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]