dev-cmd/contributions: Improve `SUPPORTED_REPOS` array syntax
dev-cmd/contributions: Improve `SUPPORTED_REPOS` array syntax

Co-authored-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

JCount/brew,nandub/brew,Homebrew/brew,MikeMcQuaid/brew,Homebrew/brew,nandub/brew,nandub/brew,nandub/brew,JCount/brew,JCount/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,Homebrew/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew