Bump MailKit from 4.4.0 to 4.7.0 (#759)

Bumps [MailKit](https://github.com/jstedfast/MailKit) from 4.4.0 to 4.7.0.
- [Changelog](https://github.com/jstedfast/MailKit/blob/master/ReleaseNotes.md)
- [Commits](https://github.com/jstedfast/MailKit/commits)

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

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Directory.Packages.props

@@ -15,7 +15,7 @@
     <PackageVersion Include="FastEndpoints.Swagger" Version="5.23.0" />
     <PackageVersion Include="FastEndpoints.Swagger.Swashbuckle" Version="2.2.0" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
-    <PackageVersion Include="MailKit" Version="4.4.0" />
+    <PackageVersion Include="MailKit" Version="4.7.0" />
     <PackageVersion Include="MediatR" Version="12.2.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.0.4" />