Update munit to 0.7.21

[alejandrohdezma]

Updates org.scalameta:munit from 0.7.20 to 0.7.21.
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 = "munit" } ]

labels: test-library-update, semver-patch

[codecov]

Codecov Report

Merging #287 (5f84ea7) into master (7740041) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #287   +/-   ##
=======================================
  Coverage   87.77%   87.77%           
=======================================
  Files          23       23           
  Lines         180      180           
  Branches        1        1           
=======================================
  Hits          158      158           
  Misses         22       22           

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