build(deps): bump Microsoft.Xaml.Behaviors.Wpf in /src (#2939)

Bumps [Microsoft.Xaml.Behaviors.Wpf](https://github.com/microsoft/XamlBehaviorsWpf) from 1.1.31 to 1.1.37.
- [Release notes](https://github.com/microsoft/XamlBehaviorsWpf/releases)
- [Commits](https://github.com/microsoft/XamlBehaviorsWpf/commits)

---
updated-dependencies:
- dependency-name: Microsoft.Xaml.Behaviors.Wpf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/ReactiveUI.Blend/ReactiveUI.Blend.csproj

@@ -20,17 +20,17 @@
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) ">
     <Compile Include="Platforms\net4\**\*.cs" />
     <Reference Include="PresentationFramework.Aero" />
-    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.31" />
+    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.37" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net5')) ">
     <Compile Include="Platforms\net4\**\*.cs" />
-    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.31" />
+    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.37" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netcoreapp3')) ">
     <Compile Include="Platforms\net4\**\*.cs" />
-    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.31" />
+    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.37" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('uap')) ">