Bump Microsoft.Bot.Builder.Dialogs.Adaptive.Runtime

Bumps [Microsoft.Bot.Builder.Dialogs.Adaptive.Runtime](https://github.com/Microsoft/botbuilder-dotnet) from 4.17.1 to 4.21.1.
- [Release notes](https://github.com/Microsoft/botbuilder-dotnet/releases)
- [Changelog](https://github.com/microsoft/botbuilder-dotnet/blob/main/Changes.md)
- [Commits](microsoft/botbuilder-dotnet@4.17.1...4.21.1)

---
updated-dependencies:
- dependency-name: Microsoft.Bot.Builder.Dialogs.Adaptive.Runtime
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Empty/Empty.csproj

@@ -1,4 +1,4 @@
-
+
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
     <TargetFramework>netcoreapp6.0</TargetFramework>
@@ -14,7 +14,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.8" />
     <PackageReference Include="Microsoft.Bot.Builder.AI.Luis" Version="4.17.1" />
     <PackageReference Include="Microsoft.Bot.Builder.AI.QnA" Version="4.17.1" />
-    <PackageReference Include="Microsoft.Bot.Builder.Dialogs.Adaptive.Runtime" Version="4.17.1" />
+    <PackageReference Include="Microsoft.Bot.Builder.Dialogs.Adaptive.Runtime" Version="4.21.1" />
     <PackageReference Include="Microsoft.Bot.Components.Teams" Version="1.4.0" />
   </ItemGroup>
 </Project>