Let's release type check (merged in #420) because the recent drop of ase.Atoms seems to cause surprise to not a few users.

TODO

• feat: Switch to importlib.resources #308
• feat: Mark C functions as deprecated #435
• feat: Explicitly mark exported API #437
• fix: Debug and warning messages #457
• ci: Test CMake version #431

@LecrisUT @atztogo Do you have any leftovers for the next minor version?