Update hls4ml recipe in conda-forge

Currently the hls4ml conda-forge feedstock (https://github.com/conda-forge/hls4ml-feedstock) recipe is broken because some of our dependencies (and their dependencies are missing from conda-forge. The full list is of missing libraries are:

• calmjs.parse
• pydigitalwavetools ==1.1
• qkeras
  • pyparser (but may not actually need it? pyparsing is on conda-forge)
  • tensorflow-model-optimization >=0.2.1

There is an example of someone uploading tensorflow-model-optimization on a separate channel: https://anaconda.org/HCC/tensorflow-model-optimization