Bump MQTTnet from 4.3.6.1152 to 4.3.7.1207

[dependabot[bot]]

Bumps MQTTnet from 4.3.6.1152 to 4.3.7.1207.

Release notes

Sourced from MQTTnet's releases.

v4.3.7.1207

• Core: Fixed issue when parsing AUTH packet with 0 length body (#2039).
• nuget: Changed code signing and nuget certificate (BREAKING CHANGE).
• TopicTemplates: Updated samples, parameter validation (#2022).
• ManagedClient: Switch SubscribeAsync/UnsubscribeAsync to IEnumerable (#2026).
• Server: Fix LoadingRetainedMessageAsync not executed (#2025).

Commits

• 740d605 Fix Unit Tests
• 9177b6a Fix Unit Tests
• f0ea5c9 Fix encoding and decoding of AUTH paket according to RFC. (#2076)
• 76479eb Setup nuget and code signing for version 4.x.x (#2069)
• e18a91a fix LoadingRetainedMessageAsync not exec (#2025)
• b95d352 Switch SubscribeAsync/UnsubscribeAsync to IEnumerable<string> (#2026)
• c5f4cf1 Topic template extension maintenance (#2022)
• 8650002 fix Managed_Client_Subscribe_Samples.Connect_Client sample: (#2023)
• See full diff in compare view

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