Bump Microsoft.Identity.Web.DownstreamApi from 3.13.2 to 4.0.1

---
updated-dependencies:
- dependency-name: Microsoft.Identity.Web.DownstreamApi
  dependency-version: 4.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/WebApi/WebApi.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Identity.Web" Version="3.13.2" />
-    <PackageReference Include="Microsoft.Identity.Web.DownstreamApi" Version="3.13.2" />
+    <PackageReference Include="Microsoft.Identity.Web.DownstreamApi" Version="4.0.1" />
   </ItemGroup>
 
 </Project>