feat: recommend granian for wsgi

[nijel]

This is what our Docker container will use, see
WeblateOrg/docker#3510

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.35%. Comparing base (ac57116) to head (205313a).
⚠️ Report is 1828 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15725      +/-   ##
==========================================
- Coverage   91.35%   91.35%   -0.01%     
==========================================
  Files         645      645              
  Lines       67308    67307       -1     
  Branches     6931     6930       -1     
==========================================
- Hits        61491    61490       -1     
  Misses       4070     4070              
  Partials     1747     1747              

see 1 file with indirect coverage changes

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