typing_extensions introduced as prod dependency where it should not have been

[jvdmr]

A recent commit made typing_extensions a required module, which now causes (our) tests to fail because this module is not installed by us, and moto also does not pull it in as a dependency:
E ModuleNotFoundError: No module named 'typing_extensions'

Current workaround is to install the typing_extensions module ourselves, but obviously this should be fixed at the source.

The offending line is this one:

moto/moto/ec2/utils.py

Line 27 in 32e7efe

from typing_extensions import TypeAlias

[bblommers]

Thanks again for providing a fix @jvdmr! We've just released a new version, so this should be solved with moto==5.0.20