Bump MailKit from 4.7.1.1 to 4.8.0

Bumps [MailKit](https://github.com/jstedfast/MailKit) from 4.7.1.1 to 4.8.0.
- [Changelog](https://github.com/jstedfast/MailKit/blob/master/ReleaseNotes.md)
- [Commits](jstedfast/MailKit@4.7.1.1...4.8.0)

---
updated-dependencies:
- dependency-name: MailKit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Exceptionless.Insulation/Exceptionless.Insulation.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="9.0.0-rc.2.24473.5" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.0-rc.2.24473.5" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="9.0.0-rc.2.24473.5" />
-    <PackageReference Include="MailKit" Version="4.7.1.1" />
+    <PackageReference Include="MailKit" Version="4.8.0" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />
     <PackageReference Include="Serilog.Formatting.Compact" Version="3.0.0" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="8.0.2" />