CI: add update flake input workflow

[veehaitch]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.23%. Comparing base (420168e) to head (94cf408).

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   89.23%   89.23%           
=======================================
  Files           1        1           
  Lines         130      130           
  Branches      130      130           
=======================================
  Hits          116      116           
  Misses          2        2           
  Partials       12       12           

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