Replace deprecated BadZipfile with BadZipFile

[hugovk]

Scope and purpose

BadZipfile (with a small f) has been deprecated since Python 3.2, use BadZipFile (big F) instead, added in 3.2.

• https://docs.python.org/3/library/zipfile.html#zipfile.BadZipfile
• Remove the error and the zipfile.ZipFile.BadZipfile aliases python/cpython#86437

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[hugovk]

please review

[glyph]

Thanks for noticing, looks great. Love to have fewer deprecation warnings.