Bump Microsoft.Identity.Web.MicrosoftGraph in /GraphTeamsApp

Bumps [Microsoft.Identity.Web.MicrosoftGraph](https://github.com/AzureAD/microsoft-identity-web) from 2.15.3 to 2.15.5.
- [Release notes](https://github.com/AzureAD/microsoft-identity-web/releases)
- [Changelog](https://github.com/AzureAD/microsoft-identity-web/blob/master/changelog.md)
- [Commits](AzureAD/microsoft-identity-web@2.15.3...2.15.5)

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

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Author: dependabot[bot]

GraphTeamsApp/GraphTeamsApp.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Graph" Version="4.54.0" />
     <PackageReference Include="Microsoft.Identity.Web" Version="2.15.5" />
-    <PackageReference Include="Microsoft.Identity.Web.MicrosoftGraph" Version="2.15.3" />
+    <PackageReference Include="Microsoft.Identity.Web.MicrosoftGraph" Version="2.15.5" />
     <PackageReference Include="TimeZoneConverter" Version="6.1.0" />
   </ItemGroup>