Bump Microsoft.AspNetCore.TestHost from 8.0.2 to 8.0.3

Bumps [Microsoft.AspNetCore.TestHost](https://github.com/dotnet/aspnetcore) from 8.0.2 to 8.0.3.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v8.0.2...v8.0.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="Markdown.ColorCode" Version="2.2.1" />
     <PackageVersion Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.22.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Rewrite" Version="2.2.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.2" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.3" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Proxies" Version="8.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.2" />