Update nano-ble-sense.md

[threexfaster]

changed from ulab.scipy to ulab.utils to fix spectrogram

What This PR Changes

Based on the current example in OpenMV, the ulab.scipy seems to be deprecated. Instead, it calls for ulab.utils.
The audio.init changes by dropping the highpass=0.9883 argument due to TypeError: extra keyword arguments given

Contribution Guidelines

• [x ] I confirm that I have read the contribution guidelines and comply with them.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}