devel/mill: Update to 0.10.9

ChangeLog: https://github.com/com-lihaoyi/mill/releases

• Fix regular expression in docs
• Use latest Mill version and extend Mima checks
• Update Scala to 2.13.10
• Remove jetty dependencies from Scala.js worker
• Update transitive dependencies
• Switched to external mill-moduledefs dependency
• Don't loose moduleDeps from super traits in PublishModule
• Reformatted sources
• Avoid calling sbt deprecated methods, stop using log4j
• Share all play (test) versions from main builds
• Add actual Mill cli as sysprop and use it in BSP config
• Add JMH contrib module
• GenIdea: Infer more values for Scala language-level
• Catch even more coursier concurrency glitches, some consolidations
• Harden GAV handling in Dep and Artifact

PR: 267852
Reported by: freebsd-ports@jan0sch.de