Bump Microsoft.AspNetCore.All in /vsd-interfaces/SharePoint

Bumps [Microsoft.AspNetCore.All](https://github.com/aspnet/AspNetCore) from 2.1.5 to 2.1.15.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@2.1.5...v2.1.15)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.All
  dependency-type: direct:production
...

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

Author: dependabot[bot]

vsd-interfaces/SharePoint/SharePoint.csproj

@@ -6,7 +6,7 @@
 
   </PropertyGroup>
  <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.1.5" />
+    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.1.15" />
     <PackageReference Include="Microsoft.IdentityModel.Clients.ActiveDirectory" Version="3.19.8" />
     <PackageReference Include="Microsoft.Rest.ClientRuntime" Version="2.3.15" />
     <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />