Update sbt-mdoc to 2.2.1

[scala-steward]

Updates org.scalameta:sbt-mdoc from 2.2.0 to 2.2.1.
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.

Configure Scala Steward for your repository with a .scala-steward.conf file.

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

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   96.38%   96.38%           
=======================================
  Files          14       14           
  Lines         443      443           
  Branches        3        3           
=======================================
  Hits          427      427           
  Misses         16       16           

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