Bump Microsoft.VisualStudio.Web.CodeGeneration.Design

Bumps [Microsoft.VisualStudio.Web.CodeGeneration.Design](https://github.com/dotnet/Scaffolding) from 6.0.16 to 9.0.0.
- [Release notes](https://github.com/dotnet/Scaffolding/releases)
- [Commits](https://github.com/dotnet/Scaffolding/commits)

---
updated-dependencies:
- dependency-name: Microsoft.VisualStudio.Web.CodeGeneration.Design
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

DigitalLearningSolutions.Web/DigitalLearningSolutions.Web.csproj

@@ -79,7 +79,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="2.2.0" />
-        <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="6.0.16" />
+        <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="9.0.0" />
         <PackageReference Include="NHSUKViewComponents.Web" Version="1.0.29" />
         <PackageReference Include="NodaTime" Version="3.2.1" />
         <PackageReference Include="Npm" Version="3.5.2" />