Fix build badges

[martincostello]

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

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.61%. Comparing base (446ef90) to head (5791d65).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1076   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files          22       22           
  Lines        1204     1204           
  Branches      122      122           
=======================================
  Hits         1103     1103           
  Misses         72       72           
  Partials       29       29           

Flag	Coverage Δ
linux	57.14% <ø> (ø)
macos	56.97% <ø> (-0.17%)	⬇️
windows	90.86% <ø> (ø)

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