After cloning the git file and going to the appropriate directory:

(.venv) < my account >:~/piper/src/python$ pip3 install -r requirements.txt
Collecting cython<1,>=0.29.0 (from -r requirements.txt (line 1))
Using cached Cython-0.29.37-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl.metadata (3.1 kB)
ERROR: Could not find a version that satisfies the requirement piper-phonemize~=1.1.0 (from versions: none)
ERROR: No matching distribution found for piper-phonemize~=1.1.0