Update to doctrine/orm 3.7

[acelaya]

Take the opportunity to also add PHP 8.6 to CI, but allowing to continue on failure for that version.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.17%. Comparing base (cf84ff8) to head (3f08c5e).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2656      +/-   ##
=============================================
- Coverage      94.21%   94.17%   -0.04%     
  Complexity      1605     1605              
=============================================
  Files            273      273              
  Lines           5017     5017              
=============================================
- Hits            4727     4725       -2     
- Misses           290      292       +2     

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