🎨 Update MaterialDesignThemes to preview

This fixes the styling issue with our logs TextBox.

MaterialDesignInXAML/MaterialDesignInXamlToolkit#3161

Author: database64128

YoutubeDl.Wpf/Views/HomeView.xaml

@@ -276,8 +276,6 @@
                  Style="{StaticResource MaterialDesignOutlinedTextBox}"
                  TextWrapping="NoWrap"
                  IsReadOnly="True"
-                 VerticalAlignment="Stretch"
-                 VerticalContentAlignment="Top"
                  VerticalScrollBarVisibility="Auto"
                  HorizontalScrollBarVisibility="Auto"
                  materialDesign:HintAssist.Hint="Output from backend"

YoutubeDl.Wpf/YoutubeDl.Wpf.csproj

@@ -41,7 +41,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MaterialDesignThemes" Version="4.8.0" />
+    <PackageReference Include="MaterialDesignThemes" Version="4.8.1-ci246" />
     <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.2.3" PrivateAssets="all" />
     <PackageReference Include="ReactiveUI.Fody" Version="18.4.34" />
     <PackageReference Include="ReactiveUI.Validation" Version="3.1.7" />