Bump Microsoft.AspNetCore.TestHost in /src/DevOpsMetrics.Tests

Bumps [Microsoft.AspNetCore.TestHost](https://github.com/dotnet/aspnetcore) from 7.0.13 to 8.0.0.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v7.0.13...v8.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.TestHost
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/DevOpsMetrics.Tests/DevOpsMetrics.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
 		<TargetFramework>net7.0</TargetFramework>
@@ -23,7 +23,7 @@
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
-		<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="7.0.13" />
+		<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="8.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Configuration" Version="7.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.AzureKeyVault" Version="3.1.24" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="7.0.0" />