Upgrade to PyCayenneLPP 2.3.0

[amotl]

Hi there,

@smlng released PyCayenneLPP 2.3.0 the other day - thanks a stack! We probably would like to use the most recent version with Terkin as well.

When looking at this, we probably want to give the canonical micropython-pycayennelpp package a spin, which came into existence starting with PyCayenneLPP 1.2.0. Currently, we are using PyCayenneLPP 1.5.0 per https://github.com/hiveeyes/pycayennelpp.

With kind regards,
Andreas.

/cc @thiasB

[amotl]

@smlng was quick to submit a patch for the issue outlined at smlng/pycayennelpp#104 already, see smlng/pycayennelpp#105. Thank you very much!