This PR is a follow up to #18881.
The changes were generated by adding
from __future__ import annotations
to the files which did not already have them and running
pyupgrade --py39-plus --keep-percent-format {jax,tests,jaxlib,examples,benchmarks}/**/*.py
We frequently use the pattern
try:
import m
except ImportError:
# do something else.
This suppresses errors when the module can be found but does not import
successfully for any reason. Instead, catch only ModuleNotFoundError so
missing modules are allowed but buggy modules still report errors.
