Update dependency mqtt to v4.3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mqtt	4.2.7 -> 4.3.8

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Release Notes

mqttjs/MQTT.js (mqtt)

v4.3.8

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v4.3.7

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Bug Fixes

• fix regression from #​1401 and allow CI test failures to break gitthub workflow (#​1443) (accd78e)

v4.3.6

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Bug Fixes

• buffer is not defined in browser (#​1420) (f5ab1b5)
• types: connect function proper overloads for its parameters (#​1416) (28c4040)

v4.3.5

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Bug Fixes

• sendPacket: drain leak (#​1401) (7ec4b8f)

v4.3.4

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Bug Fixes

• migrate LruMap from collections to lru-cache. (#​1396) (5c67037)

v4.3.3

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Bug Fixes

• remove collections.js dependency from number-allocator. (#​1394) (ee75c32), closes #​1392

v4.3.2

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Bug Fixes

• dependency: Updated collections.js related package version. (#​1386) (df89a2e)

v4.3.1

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Bug Fixes

• dependencies: remove babel-eslint and update snazzy (#​1383) (66d43d4)

v4.3.0

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Bug Fixes

• client: Refined Topic Alias support. (Implement #​1300) (#​1301) (c92b877)
• README: typo Support (#​1353) (c424426)
• resubscribe: message id allocate twice (#​1337) (7466819)
• tls: Skip TLS SNI if host is IP address (#​1311) (2679952)
• type: add properties type for IClientSubscribeOptions (#​1378) (8de9394)
• type: fix push properties types (#​1359) (cb6bdcb)
• types (#​1341) (59fab36)
• typescript: OnConnectCallback with specs expecting Connack packet (#​1333) (e3e15c3)
• typescript: Use correct version of @​types/ws (#​1358) (6581d33)
• websocket and typescript (9979443)
• websockets: revert URL WHATWG changes (a3dd38e)

Features

• add support for ALPN TLS extension (#​1332) (06f2fd2)
• client: auth handler for enhanced auth (#​1380) (d5850b7)

Reverts

• Revert "fix: types (#​1341)" (#​1344) (e6672e8), closes #​1341 #​1344

4.2.5 (2020-11-12)

Bug Fixes

• auth opts: Default to null for false-y values (#​1197) (6a0e50a)

4.2.4 (2020-10-29)

Bug Fixes

• ws: add all parts of object to opts (#​1194) (6240565)

4.2.3 (2020-10-27)

Bug Fixes

• secure: do not override password and username (#​1190) (298dbb2)

4.2.2 (2020-10-27)

Bug Fixes

• check if client connected when reconnecting (#​1162) (541f201), closes #​1152
• replace url.parse by WHATWG URL API (#​1147) (70a247c), closes #​1130
• use 'readable-stream' instead of 'stream' (#​1170) (04184e1)

4.2.1 (2020-08-24)

Bug Fixes

• websocket: browser in ws (#​1145) (40177ca)

v4.2.8: (patch release)

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This release is a patch update bugfixes.

📚 PR:
Fix ws vulnerability and typescript bug (#​1292)

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