Bump Microsoft.Identity.Web.GraphServiceClient in /GraphTutorial

Bumps [Microsoft.Identity.Web.GraphServiceClient](https://github.com/AzureAD/microsoft-identity-web) from 3.6.2 to 3.8.4.
- [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@3.6.2...3.8.4)

---
updated-dependencies:
- dependency-name: Microsoft.Identity.Web.GraphServiceClient
  dependency-version: 3.8.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

GraphTutorial/GraphTutorial.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
@@ -14,7 +14,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Identity.Web" Version="3.6.2" />
-    <PackageReference Include="Microsoft.Identity.Web.GraphServiceClient" Version="3.6.2" />
+    <PackageReference Include="Microsoft.Identity.Web.GraphServiceClient" Version="3.8.4" />
     <PackageReference Include="Microsoft.Identity.Web.UI" Version="3.6.2" />
     <PackageReference Include="Stylecop.Analyzers" Version="1.2.0-beta.556">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>