chore: Update Github Action badge URL in README

[hkrutzer]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.32%. Comparing base (4af0e4d) to head (9e9acfc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #803   +/-   ##
=======================================
  Coverage   17.32%   17.32%           
=======================================
  Files          24       24           
  Lines         710      710           
=======================================
  Hits          123      123           
  Misses        587      587           

Flag	Coverage Δ
api	17.32% <ø> (ø)
elixir	17.32% <ø> (ø)

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