[build] Update sbt, scripted-plugin to 1.12.9#128

scala-steward wants to merge 1 commit intorayrobdod:mainrayrobdod/string-context-parser-combinator:mainfrom

scala-steward:update/sbt-1.12.9scala-steward/string-context-parser-combinator:update/sbt-1.12.9Copy head branch name to clipboard