Bump Microsoft.Identity.Web.UI from 2.14.0 to 2.15.1 (#2506)

Bumps [Microsoft.Identity.Web.UI](https://github.com/AzureAD/microsoft-identity-web) from 2.14.0 to 2.15.1.
- [Release notes](https://github.com/AzureAD/microsoft-identity-web/releases)
- [Changelog](https://github.com/AzureAD/microsoft-identity-web/blob/master/changelog.md)
- [Commits](https://github.com/AzureAD/microsoft-identity-web/commits/2.15.1)

---
updated-dependencies:
- dependency-name: Microsoft.Identity.Web.UI
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/DevApps/ciam/myWebApp/myWebApp.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup Condition="'$(UseWIP)' == 'false' ">
     <PackageReference Include="Microsoft.Identity.Web" Version="2.15.1" />
-    <PackageReference Include="Microsoft.Identity.Web.UI" Version="2.14.0" />
+    <PackageReference Include="Microsoft.Identity.Web.UI" Version="2.15.1" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(UseWIP)' == 'true' ">