Bump paho-mqtt from 1.1 to 1.6.1

[dependabot]

Bumps paho-mqtt from 1.1 to 1.6.1.

Changelog

Sourced from paho-mqtt's changelog.

v1.6.1 - 2021-10-21

• Fix Python 2.7 compatilibity.

v1.6.0 - 2021-10-20

• Changed default TLS version to 1.2 instead of 1.0.
• Fix incoming MQTT v5 messages with overall property length > 127 bytes being incorrectly decoded. Closes #541.
• MQTTMessageInfo.wait_for_publish() and MQTTMessageInfo.is_published() will now raise exceptions if called when the publish call produced an error. Closes #550.
• Remove periodic retry checks for outgoing messages with QoS>0. This means that outgoing messages will only be retried on the client reconnecting to the server. They will not be retried when the client is still connected.
• The rc parameter in the on_disconnect callback now has meaningful values in the case of an error. Closes #441.
• Callbacks can now be applied to client instances using decorators.
• PUBACK messages are now sent to the broker only after the on_message callback has returned.
• Raise exceptions when attempting to set MQTT v5 properties to forbidden values. Closes #586.
• Callbacks can now be updated from within a callback.
• Remove _out_packet_mutex and _current_out_packet_mutex and convert the _out_packet queue use to thread safe.
• Add basic MQTT v5 support to the subscribe and publish helper functions. Closes #575.
• Fix on_disconnect() sometimes calling the MQTT v3.x callback when it should call the MQTT v5 callback. Closes #570.
• Big performance improvement when receiving large payloads, particularly for SSL. Closes #571,
• Fix connecting with MQTT v5 to a broker that doesn't support MQTT v5. Closes #566.
• Removed ancient Mosquitto compatibility class.
• Fix exception on calling Client(client_id="", clean_session=False). Closes #520.
• Experimental support for Websockets continuation frames. Closes #500. Closes #89.
• Properties.json() now converts Correlation Data bytes() objects to hex. Closes #555.
• Only use the internal sockpair wakeup when running with loop_start() or loop(). This removes problems when running with an external event loop.
• Drain all of sockpairR bytes to avoid unnecessary wakeups and possible timeouts. Closes #563.
• Add timeout to MQTTMessageInfo:wait_for_publish().

... (truncated)

Commits

• 9782ab8 Merge branch '1.6.x'
• 1f3cd09 Doc update, bump version.
• 6436ac0 Merge pull request #611 from BertKleewein/1.6-fix-py27
• 59a684e Fix python 2.7
• 6dfdeba Merge branch '1.6.x'
• 3d47d37 Bump version
• fabe750 Update to EPL-2.0
• 6151d96 Fix language typos.
• 550da7d Update wait_for_publish() documentation.
• 0c2ac47 Fix None comparison.
• Additional commits viewable in compare view

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