Add postgresql 16 to tests, drop postgresql 11

[fizyk]

Chore that needs to be done:

• Add newsfragment pipenv run towncrier create [issue_number].[type].rst

Types are defined in the pyproject.toml, issue_numer either from issue tracker or the Pull request number

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e8b12f9) 95.45% compared to head (679ea95) 95.45%.
Report is 2 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #836   +/-   ##
=======================================
  Coverage   95.45%   95.45%           
=======================================
  Files          13       13           
  Lines         396      396           
=======================================
  Hits          378      378           
  Misses         18       18           

Flag	Coverage Δ
unittests	95.45% <ø> (ø)

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