Bump Eto.Platform.Wpf and Eto.Forms

Bumps [Eto.Platform.Wpf](https://github.com/picoe/Eto) and [Eto.Forms](https://github.com/picoe/Eto). These dependencies needed to be updated together.

Updates `Eto.Platform.Wpf` from 2.8.2 to 2.8.3
- [Release notes](https://github.com/picoe/Eto/releases)
- [Commits](https://github.com/picoe/Eto/compare/2.8.2...2.8.3)

Updates `Eto.Forms` from 2.8.2 to 2.8.3
- [Release notes](https://github.com/picoe/Eto/releases)
- [Commits](https://github.com/picoe/Eto/compare/2.8.2...2.8.3)

---
updated-dependencies:
- dependency-name: Eto.Platform.Wpf
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Eto.Forms
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

GlennGUI/GlennGUI.Wpf/GlennGUI.Wpf.csproj

@@ -12,7 +12,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Eto.Platform.Wpf" Version="2.8.2" />
+        <PackageReference Include="Eto.Platform.Wpf" Version="2.8.3" />
     </ItemGroup>
 
 </Project>