Update magnolia to 0.12.6

[scala-steward]

Updates com.propensive:magnolia from 0.12.5 to 0.12.6.
Release Notes/Changelog

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 me in the comments below.

Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.propensive", artifactId = "magnolia" } ]

labels: library-update, semver-patch

[codecov-io]

Codecov Report

Merging #127 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #127   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          15     15           
  Lines         733    733           
  Branches       30     30           
=====================================
  Hits          733    733

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