feat(DockView): add shadow for float panel (#6415)

Author: ArgoZhang

src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj

@@ -33,7 +33,7 @@
     <PackageReference Include="BootstrapBlazor.ChatBot" Version="9.0.0" />
     <PackageReference Include="BootstrapBlazor.CherryMarkdown" Version="9.0.1" />
     <PackageReference Include="BootstrapBlazor.Dock" Version="9.0.0" />
-    <PackageReference Include="BootstrapBlazor.DockView" Version="9.1.16" />
+    <PackageReference Include="BootstrapBlazor.DockView" Version="9.1.17" />
     <PackageReference Include="BootstrapBlazor.DriverJs" Version="9.0.3" />
     <PackageReference Include="BootstrapBlazor.ElementIcon" Version="9.0.3" />
     <PackageReference Include="BootstrapBlazor.FileViewer" Version="9.0.0" />