feat(media) : increase the t_medias.source varchar size

[jacquesfize]

resolves #592

Fix on Taxref with relationship synonymes which points to other rows including the current row itself -> https://docs.sqlalchemy.org/en/20/orm/relationship_persistence.html#rows-that-point-to-themselves-mutually-dependent-rows

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.71%. Comparing base (e47fcd4) to head (99a5403).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #595   +/-   ##
========================================
  Coverage    52.71%   52.71%           
========================================
  Files           37       37           
  Lines         2445     2445           
========================================
  Hits          1289     1289           
  Misses        1156     1156           

Flag	Coverage Δ
pytest	52.71% <ø> (ø)

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