Bump Microsoft.AspNetCore.Hosting.WindowsServices from 3.1.7 to 3.1.8
Bump Microsoft.AspNetCore.Hosting.WindowsServices from 3.1.7 to 3.1.8

Bumps [Microsoft.AspNetCore.Hosting.WindowsServices](https://github.com/aspnet/AspNetCore) from 3.1.7 to 3.1.8.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Commits](https://github.com/aspnet/AspNetCore/compare/v3.1.7...v3.1.8)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rnwood/smtp4dev,rnwood/smtp4dev,rnwood/smtp4dev,rnwood/smtp4dev