rapidpe_compute_instrinsic_fisher requires python-ligo-lw < 1.8.0

The rapidpe_compute_intrinsic_fisher script is attempting to import the ligo.lw.ilwd module that was removed in https://git.ligo.org/kipp.cannon/python-ligo-lw/-/commit/a292464f1c4742548432b2b0ac635dcc86ac82e1 (Jun 2021, first released as python-ligo-lw 1.8.0):

$ python ./bin/rapidpe_compute_intrinsic_fisher --help
Traceback (most recent call last):
  File "/home/duncan/git/rapidpe/./bin/rapidpe_compute_intrinsic_fisher", line 39, in <module>
    from ligo.lw import utils, ligolw, lsctables, table, ilwd
ImportError: cannot import name 'ilwd' from 'ligo.lw' (/home/duncan/opt/mambaforge/envs/py310/lib/python3.10/site-packages/ligo/lw/__init__.py)