chore(master): release 1.6.0 [skip-ci]

[github-actions]

🤖 I have created a release beep boop

1.6.0 (2026-02-11)

Features

• add DANE/TLSA support for outbound SMTP connections (8705f72)
• add DANE/TLSA support for outbound SMTP connections (dd8525b)

Bug Fixes

• add engines field requiring Node.js 14+ (56ebbfc)
• address code review feedback for DANE/TLSA support (e1f4c7f)
• dane: address post-merge issues in DANE/TLSA implementation (a000cdc)
• dns-errors: correct EOF error code and improve descriptions (5899eef)
• get-connection: destroy socket on connection error to prevent handle leak (bd3e8f5)
• net-errors: update error codes and descriptions from libuv (36beca2)
• use userland punycode and fix preferIPv6 sort (68ae733)

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