nuget: bump Avalonia from 0.10.15 to 0.10.18 (#3817)

Bumps [Avalonia](https://github.com/AvaloniaUI/Avalonia) from 0.10.15 to 0.10.18.
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](https://github.com/AvaloniaUI/Avalonia/compare/0.10.15...0.10.18)

---
updated-dependencies:
- dependency-name: Avalonia
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Ryujinx.Ava/Ryujinx.Ava.csproj

@@ -18,7 +18,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="0.10.15" />
+    <PackageReference Include="Avalonia" Version="0.10.18" />
     <PackageReference Include="Avalonia.Desktop" Version="0.10.15" />
     <PackageReference Include="Avalonia.Diagnostics" Version="0.10.15" />
     <PackageReference Include="Avalonia.Controls.DataGrid" Version="0.10.15" />