Bump Avalonia.ReactiveUI from 11.3.7 to 11.3.8

---
updated-dependencies:
- dependency-name: Avalonia.ReactiveUI
  dependency-version: 11.3.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

ImageMerge/ImageMerge.csproj

@@ -16,7 +16,7 @@
         <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.8"/>
         <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
         <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.3.8"/>
-        <PackageReference Include="Avalonia.ReactiveUI" Version="11.3.7"/>
+        <PackageReference Include="Avalonia.ReactiveUI" Version="11.3.8"/>
         <PackageReference Include="MessageBox.Avalonia" Version="3.2.0"/>
         <PackageReference Include="NetVips" Version="3.1.0"/>
         <PackageReference Include="NetVips.Native.osx-arm64" Version="8.16.0" Condition="$([MSBuild]::IsOsPlatform('OSX'))"/>