Backport "Fix #22922: Add TypeParamRef handling in isSingletonBounded" to 3.3 LTS#509

tgodzik merged 3 commits intolts-3.3scala/scala3-lts:lts-3.3from

backport-lts-3.3-23501scala/scala3-lts:backport-lts-3.3-23501Copy head branch name to clipboard