Update Mage

[philippgille]

From 1.13 to 1.15. See their release notes:

• https://github.com/magefile/mage/releases/tag/v1.14.0
• https://github.com/magefile/mage/releases/tag/v1.15.0

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (504729c) 65.26% compared to head (7eb9f95) 65.26%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   65.26%   65.26%           
=======================================
  Files          25       25           
  Lines        2096     2096           
=======================================
  Hits         1368     1368           
  Misses        601      601           
  Partials      127      127           

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