Update scala-library to 2.12.21 in series/3.x#1446

scala-steward wants to merge 1 commit intofd4s:series/3.xfd4s/fs2-kafka:series/3.xfrom

scala-steward:update/series/3.x/scala-library-2.12.21scala-steward/fs2-kafka:update/series/3.x/scala-library-2.12.21Copy head branch name to clipboard