[Bug 1771559] Fix proposed to horizon (stable/stein)

[OpenStack Infra]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/722533

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https://bugs.launchpad.net/bugs/1771559

Title:
  error while loading icon with pyscss 1.3.5 or later

Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in python-pyscss package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  Impossible to fetch font awesome icons with material design theme (provided in the package)
  No error in the web development console, but browser show symbol number like "xf44f" instead of showing icons.

  STEPS TO REPRODUCE:
  Use Chrome web browser
  Login to horizon
  Change theme to "Material"
  Try to use Horizon as usual

  Regards.

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