Update cats-core to 1.6.0

[scala-steward]

Updates org.typelevel:cats-core from 1.5.0 to 1.6.0.

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]

Codecov Report

Merging #609 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #609   +/-   ##
=======================================
  Coverage   93.15%   93.15%           
=======================================
  Files          65       65           
  Lines         716      716           
  Branches       10       10           
=======================================
  Hits          667      667           
  Misses         49       49

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