Log Message:
py-multidict: updated to 4.7.3

4.7.3:
Features
- Implement ``__sizeof__`` function to correctly calculate all internal \ 
structures size.
- Expose ``getversion()`` function.

Bugfixes
- Fix crashes in ``popone``/``popall`` when default is returned.

Improved Documentation
- Corrected the documentation for ``MultiDict.extend()``

4.7.2:
Bugfixes
- Fix crashing when multidict is used pyinstaller
- Fix typing for `CIMultiDict.copy`
- Fix memory leak in ``MultiDict.copy()``