Bump MailKit from 4.8.0 to 4.9.0 (#894)

Bumps [MailKit](https://github.com/jstedfast/MailKit) from 4.8.0 to 4.9.0.
- [Changelog](https://github.com/jstedfast/MailKit/blob/master/ReleaseNotes.md)
- [Commits](jstedfast/MailKit@4.8.0...4.9.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="FastEndpoints.Swagger" Version="5.31.0" />
     <PackageVersion Include="FastEndpoints.Swagger.Swashbuckle" Version="2.2.0" />
     <PackageVersion Include="FluentAssertions" Version="6.12.2" />
-    <PackageVersion Include="MailKit" Version="4.8.0" />
+    <PackageVersion Include="MailKit" Version="4.9.0" />
     <PackageVersion Include="MediatR" Version="12.4.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.0" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.0" />