workflow update

[JeffFessler]

• use julia-actions
• use julia-version
• dependabot supersedes CompatHelper
• workspace with julia v1.12
• badge/url tweaks
• actually run aqua in tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4596813) to head (2ba4cfa).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #153   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        38           
  Lines         1364      1364           
=========================================
  Hits          1364      1364           

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