Fixes

• CI fixes (#520, #553)
  (by @altendky in 7783f1c, @dulmandakh in 1dd40f1)

• Make extract_stack resilient to lacking frames. (#563)
  (by @jhance in 0687643 for #563)

• Port uvloop to Python 3.12 (#570)
  (by @1st1, @fantix in 9f82bd7 for #569)