Update SSH.NET to 2023.0.0

[WojciechNagorski]

Update SSH.NET to the latest version https://www.nuget.org/packages/SSH.NET/2023.0.0

New features:

• Support for .NET 6, 7, and .NET Standard 2.0/2.1
• Support for RSA-SHA256/512 signature algorithms
• Support for parsing OpenSSH keys with ECDSA 256/384/521 and RSA
• Support for SHA256 and MD5 fingerprints for host key validation
• Added async support to SftpClient and SftpFileStream
• Added ISftpFile interface to SftpFile
• Removed support for old target frameworks
• Improved performance and stability
• Added the ability to set the last write and access time for Sftp files