mailpit 1.15.0

[BrewTestBot]

Created by brew bump

---

Created with brew bump-formula-pr.

release notes

### Notice
This release adds TLS (or sometimes called "SSL/TLS") support for SMTP. This is easily confused with the default STARTTLS which is an entirely different protocol (and far more widely used). The original Mailpit flag `--smtp-tls-required` was somewhat confusing because in reality both TLS and STARTTLS use TLS, however both work in very different ways and are incompatible protocols.
As a result of this, --smtp-tls-required has been deprecated and replaced with --smtp-require-starttls to enforce STARTTLS, and a new flag --smtp-require-tls has been added to use TLS. To help prevent issues, the deprecated --smtp-tls-required has been aliased with --smtp-require-starttls and a startup warning is displayed.
Feature

Add SMTP SSL/TLS option (#265)

Fix

Enforce SMTP STARTTLS by default if authentication is set in line with RFC 4954

Chore

Update node dependencies
Update Go dependencies

[github-actions]

🤖 An automated task has requested bottles to be published to this PR.