Update dependency org.scalameta:sbt-mdoc to v2.2.21

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
org.scalameta:sbt-mdoc	plugin	patch	2.2.21	source

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Release Notes

scalameta/mdoc

v2.2.21

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What’s Changed

• Add support for Scala 3.0.0 (#​501) @​tgodzik
• Change default Scala version to 2.13 (#​497) @​tgodzik
• Add option to specify modifier in the worksheet API (#​492) @​tgodzik
• Drop support for Scala 3.0.0-M2 and 3.0.0-M3 (#​496) @​tgodzik
• Update sbt to 1.5.2 (#​495) @​tgodzik
• Scala 3 support (#​466) @​keynmol
• Migrate to evilplot hosted on sonatype (#​493) @​tgodzik
• Update scalameta, testkit to 4.4.14 (#​490) @​scala-steward
• Update sbt-dotty to 0.5.5 (#​487) @​scala-steward
• Update undertow-core to 2.2.7.Final (#​488) @​scala-steward

v2.2.20

Compare Source

• Add support for Scala 3.0.0-RC3 (#​486) @​tgodzik
• Switch default branch to main. (#​483) @​ckipp01
• Update directory-watcher. (#​484) @​ckipp01
• Get behind unified slash syntax. (#​482) @​ckipp01
• Update scalameta to 4.4.11 (#​480) @​tgodzik

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