ai-edge-litert has now replaced tflite-runtime for python 3.12 or later

[percy9427]

Setup will not run since a matching version of tflite-runtime can't be found. It has been replacd by ai-edge-litert. To fix, I replaced tflite-runtime with ai-edge-litert in requirements.txt. In openwakeword.py I replaced import tensorflow.lite as tflite with import ai_edge_litert.interpreter as tflite