Update sbt-mdoc to 2.2.9

[scala-steward]

Updates org.scalameta:sbt-mdoc from 2.2.8 to 2.2.9.
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

[sideeffffect]

@adamgfraser can we try closing and reopening this PR, to let auto-approve run again, and hopefully see it succeed and merge the PR?

[adamgfraser]

Sure. Let me try right now.

[adamgfraser]

Seems like closing and reopening didn't cause anything to be rerun.

[sideeffffect]

🤔
hmm... when looking at https://github.com/zio/zio-prelude/pull/295/checks?check_run_id=1136714722 do you see a button to re-run/restart the job? (should be in the top right area)

[adamgfraser]

Just did and looks like that part worked.

[sideeffffect]

I asked the developer(s) hmarr/auto-approve-action#166