Bump Microsoft.AspNetCore.Hosting.WindowsServices from 3.1.18 to 3.1.19

Bumps [Microsoft.AspNetCore.Hosting.WindowsServices](https://github.com/aspnet/AspNetCore) from 3.1.18 to 3.1.19.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Commits](dotnet/aspnetcore@v3.1.18...v3.1.19)

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

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

Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj

@@ -24,7 +24,7 @@
 		<PackageReference Include="CommandLiners.MonoOptions" Version="1.0.36" />
 		<PackageReference Include="HtmlAgilityPack" Version="1.11.37" />
 		<PackageReference Include="MailKit" Version="2.13.0" />
-		<PackageReference Include="Microsoft.AspNetCore.Hosting.WindowsServices" Version="3.1.18" />
+		<PackageReference Include="Microsoft.AspNetCore.Hosting.WindowsServices" Version="3.1.19" />
 		<PackageReference Include="Microsoft.AspNetCore.SignalR" Version="1.1.0" />
 		<PackageReference Include="Microsoft.AspNetCore.SignalR.Core" Version="1.1.0" />
 		<PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.2.0" />