Update dependency aiomqtt to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
paho-mqtt	^1.6.1 -> ^2.0.0

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[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: poetry.lock

Updating dependencies
Resolving dependencies...


Because no versions of aiomqtt match >1.2.0,<1.2.1 || >1.2.1,<2.0.0
 and aiomqtt (1.2.0) depends on paho-mqtt (>=1.6.0,<2.0.0), aiomqtt (>=1.2.0,<1.2.1 || >1.2.1,<2.0.0) requires paho-mqtt (>=1.6.0,<2.0.0).
And because aiomqtt (1.2.1) depends on paho-mqtt (>=1.6.0,<2.0.0), aiomqtt (>=1.2.0,<2.0.0) requires paho-mqtt (>=1.6.0,<2.0.0).
So, because mqtt-to-eventhub depends on both paho-mqtt (^2.0.0) and aiomqtt (^1.2.0), version solving failed.

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