Update sbt-mdoc to 2.1.5

[scala-steward]

Updates org.scalameta:sbt-mdoc from 2.1.4 to 2.1.5.
GitHub Release Notes - Version Diff

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 = "org.scalameta", artifactId = "sbt-mdoc" } ]

labels: sbt-plugin-update, semver-patch

[codecov]

Codecov Report

Merging #328 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #328   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          394       394           
  Branches        21        21           
=========================================
  Hits           394       394           

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