Update mill-contrib-testng, mill-main to 0.11.6

[scala-steward]

About this PR

📦 Updates

• com.lihaoyi:mill-contrib-testng
• com.lihaoyi:mill-main

from 0.11.5 to 0.11.6

📜 GitHub Release Notes - Release Notes - Version Diff

Usage

✅ Please merge!

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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⚙ Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.lihaoyi" } ]

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dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "com.lihaoyi" }
}]

^{labels: library-update, early-semver-minor, semver-spec-patch, commit-count:1}