build: bump ilt-panphon to 0.21.4 which removes setuptools dep

[joanise]

PR Goal?

bump production to use ilt-panphon 0.21.4, which removes setuptools dependency

Fixes?

Feedback sought?

rubber stamping

Priority?

low

Tests added?

already covered in CI

How to test?

install a production env the way Heroku does and run the web api

Confidence?

high

Version change?

no

[semanticdiff-com]

Review changes with  

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.59%. Comparing base (c97f5f2) to head (87b4b19).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #290   +/-   ##
=======================================
  Coverage   88.59%   88.59%           
=======================================
  Files          22       22           
  Lines        1885     1885           
  Branches      309      309           
=======================================
  Hits         1670     1670           
  Misses        178      178           
  Partials       37       37           

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[github-actions]

CLI load time: 0:00.04
Pull Request HEAD: 87b4b19811b404cf0ab5228604602d1ac41e0399
No imports take more than 0.1 s.