Remove unused dependencies

[mi-hol]

With recent changes 2 dependencies became unused.
I went ahead and removed them but have no possibility to test the created bin yet!
Build action https://github.com/mi-hol/HeishaMon/actions/runs/10759232099 is successful

[mi-hol]

@IgorYbema looking at .github/workflows/main.yml
the command line is now:
run: arduino-cli lib install ringbuffer pubsubclient arduinojson dallastemperature onewire "Adafruit NeoPixel"

Therefore the open question is:
Is platformio.ini actually used?

[IgorYbema]

No and I don't know how that got into the repo

[geduxas]

@IgorYbema looking at .github/workflows/main.yml the command line is now: run: arduino-cli lib install ringbuffer pubsubclient arduinojson dallastemperature onewire "Adafruit NeoPixel"

Therefore the open question is: Is platformio.ini actually used?

No platformIO is not used. #376 is all it's history.

[mi-hol]

thanks for clarification, I've amended PR accordingly