update rarfile.py

[thezoggy]

our util/rarfile.py is version 3.0 from 2016, latest release was 4.0 from 2020.
https://github.com/markokr/rarfile/releases/tag/v4.0

While our version works there has been a few updates to upstream repo (add sfx, support longer than 28char passwords, drop python2 support, python3 related updates to leverage newer libs and streamlines things some more with hashlib).

list of changes:
https://github.com/markokr/rarfile/blob/master/doc/news.rst

[Safihre]

I know, but his changes made some of our required patches very hard to apply again.
So there was this issue:
markokr/rarfile#56
And then this, so we wouldn't need to vendor rarfile anymore:
markokr/rarfile#74

I guess I can just give up and vendor it again.

[github-actions]

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[Safihre]

Finally he released a new version with the needed patches.