make dependencies work again

[biancarosa]

3 problems:

• linter started failing due to timeout on requests.get
• flask 1.x is has fallen into the sunset.
• pipenv version was severely outdated (it's been 4 yrs!)
• codecov gh action didn't work anymore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ccfe63a) to head (69a7e12).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           59        60    +1     
=========================================
+ Hits            59        60    +1     

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