textproc/py-mkdocstrings-python: Update to 1.10.7

• Switch back to PyPI because the tests are now available in the sdists again since the 1.10.7 release.

Changelogs since 1.10.5:

https://github.com/mkdocstrings/python/releases/tag/1.10.7
https://github.com/mkdocstrings/python/releases/tag/1.10.6