Remove `wave` from requirements-dev.txt (#12387)
This resolves to <https://pypi.org/project/Wave/>, but the places where
the `wave` module is imported make it clear that the standard library
module <https://docs.python.org/3/library/wave.html> was intended.
Was originally added in #11820 and used in the following files:
* `util/sample_parser.py`
* `util/wavetable_parser.py`
Excitable Snowball