Fix build badges

[martincostello]

Fix-up the build badges as the old URLs seem to have stopped working.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.39%. Comparing base (77e29c3) to head (760cddc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2445   +/-   ##
=======================================
  Coverage   85.39%   85.39%           
=======================================
  Files         312      312           
  Lines        7464     7464           
  Branches     1121     1121           
=======================================
  Hits         6374     6374           
  Misses        905      905           
  Partials      185      185           

Flag	Coverage Δ
linux	85.39% <ø> (ø)
macos	85.39% <ø> (+0.02%)	⬆️
windows	85.33% <ø> (-0.03%)	⬇️

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