language data: upgrade pickle to v5

[adbar]

closes #158.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.27%. Comparing base (fae9d47) to head (a17cd83).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #162   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files          35       35           
  Lines         624      624           
=======================================
  Hits          607      607           
  Misses         17       17           

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