update for ghc-9.12 & silence various warnings#256

NadiaYvette wants to merge 5 commits into

snoyberg:mastersnoyberg/mono-traversable:masterfrom

NadiaYvette:nadia.chambers/ghc-9.12-update-001NadiaYvette/mono-traversable-nyc:nadia.chambers/ghc-9.12-update-001Copy head branch name to clipboard