nuget: bump the avalonia group with 2 updates

Bumps the avalonia group with 2 updates: [Avalonia.Svg](https://github.com/wieslawsoltes/Svg.Skia) and [Avalonia.Svg.Skia](https://github.com/wieslawsoltes/Svg.Skia).


Updates `Avalonia.Svg` from 11.0.0.16 to 11.0.0.18
- [Release notes](https://github.com/wieslawsoltes/Svg.Skia/releases)
- [Changelog](https://github.com/wieslawsoltes/Svg.Skia/blob/master/CHANGELOG.md)
- [Commits](https://github.com/wieslawsoltes/Svg.Skia/commits)

Updates `Avalonia.Svg.Skia` from 11.0.0.16 to 11.0.0.18
- [Release notes](https://github.com/wieslawsoltes/Svg.Skia/releases)
- [Changelog](https://github.com/wieslawsoltes/Svg.Skia/blob/master/CHANGELOG.md)
- [Commits](https://github.com/wieslawsoltes/Svg.Skia/commits)

---
updated-dependencies:
- dependency-name: Avalonia.Svg
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: avalonia
- dependency-name: Avalonia.Svg.Skia
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: avalonia
...

Signed-off-by: dependabot[bot] <support@github.com>

Directory.Packages.props

@@ -8,8 +8,8 @@
     <PackageVersion Include="Avalonia.Desktop" Version="11.0.10" />
     <PackageVersion Include="Avalonia.Diagnostics" Version="11.0.10" />
     <PackageVersion Include="Avalonia.Markup.Xaml.Loader" Version="11.0.10" />
-    <PackageVersion Include="Avalonia.Svg" Version="11.0.0.16" />
-    <PackageVersion Include="Avalonia.Svg.Skia" Version="11.0.0.16" />
+    <PackageVersion Include="Avalonia.Svg" Version="11.0.0.18" />
+    <PackageVersion Include="Avalonia.Svg.Skia" Version="11.0.0.18" />
     <PackageVersion Include="CommandLineParser" Version="2.9.1" />
     <PackageVersion Include="Concentus" Version="1.1.7" />
     <PackageVersion Include="DiscordRichPresence" Version="1.2.1.24" />