Bump Microsoft.Extensions.Hosting from 3.1.8 to 5.0.0 in /src

Bumps [Microsoft.Extensions.Hosting](https://github.com/dotnet/runtime) from 3.1.8 to 5.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

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

src/aggregator-host/aggregator-host.csproj

@@ -22,7 +22,7 @@
   <ItemGroup>
     <!-- resolves MSB3277 -->
     <PackageReference Include="System.Text.Json" Version="4.7.2" />
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="3.1.8" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>