[IOCOM-1479] Latest backend specs to include organization_fiscal_code

[Vangaorth]

Short description

This PR updates the backend spec to include organization_fiscal_code in the GET /messages response.

List of changes proposed in this pull request

• Backend Spec to 13.39.1

How to test

Static checks and server starting should run without errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.66%. Comparing base (33ca3dd) to head (412b681).
Report is 3 commits behind head on master.

❗ Current head 412b681 differs from pull request most recent head 769a412

Please upload reports for the commit 769a412 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #387   +/-   ##
=======================================
  Coverage   69.66%   69.66%           
=======================================
  Files         156      156           
  Lines        5008     5008           
  Branches      605      605           
=======================================
  Hits         3489     3489           
+ Misses       1518     1441   -77     
- Partials        1       78   +77     

see 26 files with indirect coverage changes

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[forrest57]

LGTM