Update dependency MailKit to 4.8.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
MailKit (source)	nuget	minor	4.7.1.1 -> 4.8.0

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Release Notes

jstedfast/MailKit (MailKit)

v4.8.0

Compare Source

• Added a UniqueIdRange.SortOrder property.
• Updated the protocol log help link for ProtocolExceptions. (issue #​1800)
• Fix SmtpClient.Dispose() when telemetry is configured. (issue #​1816)
• Added ProxyClient.SystemProxy as a convenience property that wraps the default system proxy (aka HttpClient.DefaultProxy) on net6.0+.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.74%. Comparing base (56c4346) to head (fe75b22). Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #676   +/-   ##
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  Coverage   81.74%   81.74%           
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  Files         215      215           
  Lines        3999     3999           
  Branches      491      491           
=======================================
  Hits         3269     3269           
  Misses        606      606           
  Partials      124      124           

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