Bump DialogHost.Avalonia from 0.7.7 to 0.7.9

Bumps [DialogHost.Avalonia](https://github.com/AvaloniaUtils/DialogHost.Avalonia) from 0.7.7 to 0.7.9.
- [Release notes](https://github.com/AvaloniaUtils/DialogHost.Avalonia/releases)
- [Commits](AvaloniaUtils/DialogHost.Avalonia@v0.7.7...v0.7.9)

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

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

GTiff2Tiles.Avalonia/GTiff2Tiles.Avalonia.csproj

@@ -12,7 +12,7 @@
         <PackageReference Include="Avalonia.Diagnostics" Version="11.0.10" />
         <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.10" />
         <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.10" />
-        <PackageReference Include="DialogHost.Avalonia" Version="0.7.7" />
+        <PackageReference Include="DialogHost.Avalonia" Version="0.7.9" />
         <PackageReference Include="MaxRev.Gdal.Universal" Version="3.9.0.218" />
         <PackageReference Include="NetVips.Native" Version="8.15.2" />