* Target net6.0
* Use new Enum.TryParse(ReadOnlySpan<char>) overload
* Replace RNGCryptoServiceProvider with RandomNumberGenerator
* ci - target net6.0 (#6594)
* Update deployment for dotnet6
* Use generic 6.0.x preview for CI
* Update direct dotnet download links
Co-authored-by: Bond_009 <bond.009@outlook.com>