Support 9.12

[tomjaguarpaw]

Blocked on at least:

• postgresql-simple
  • Allow GHC 9.12 haskellari/postgresql-simple#152
  • fix: allow GHC 9.12 haskellari/postgresql-simple#153

[ysangkok]

postgresql-simple-0.7.0.1 has been released to hackage: https://hackage.haskell.org/package/postgresql-simple-0.7.0.1