• Suppress warnings previously printed to stdout when parsing YAML internally.
• Fix error thrown when inserting duplicate keys to different maps in the same
  list.
  (#69)
• Fix error thrown when inserting in nested list using spliceList method
  (#83)
• Fix error thrown when string has spaces when applying ScalarStyle.FOLDED.
  (#41). Resolves
  ([#86]).
• Require Dart 3.1
• Move to dart-lang/tools monorepo.