Update simulacrum to 0.15.0

[scala-steward]

Updates com.github.mpilquist:simulacrum from 0.14.0 to 0.15.0.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention @scala-steward in the comments below.

Have a nice day!

[codecov-io]

Codecov Report

Merging #2703 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2703   +/-   ##
=======================================
  Coverage   95.13%   95.13%           
=======================================
  Files         365      365           
  Lines        6780     6780           
  Branches      312      294   -18     
=======================================
  Hits         6450     6450           
  Misses        330      330

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