Version 3.4

🍩 Package improvements

• Enable deterministic build @304NotModified (#124)
• Enabled SourceLink @304NotModified (#127)
• Create and publish snupkg @304NotModified (#123)

↜ Dependencies

• Bump MailKit to 2.9.0 @304NotModified (#128)
• Bump NLog from 4.7.4 to 4.7.12 @304NotModified @dependabot-preview (#96, #112, #125)