fix(deps): update dependency smtp-server to v3.19.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
smtp-server	3.18.5 → 3.19.0

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Release Notes

nodemailer/smtp-server (smtp-server)

v3.19.0

Compare Source

Features

• add lenientAddressParsing option to relax strict address validation (2237bb4), closes #​259
• update stream.sizeExceeded and byteLength in real time (9051734)

Bug Fixes

• cap PROXY header length to prevent unbounded buffering (38a3190)
• expose SASL PLAIN authzid and reject control characters in usernames (4107568), closes #​261
• handle half-open socket close while reading PROXY header (cdaefd8)
• prevent uncaughtException when client disconnects before PROXY header (e240a50)
• reject STARTTLS parameters and control characters in envelope input (db1f3d4), closes #​260
• use crypto.randomBytes for CRAM-MD5 challenge (4dbc916)

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