[aur-requests] [PRQ#16374] Merge Request for python-altair3

mhsekhavat [1] filed a request to merge python-altair3 [2] into python-altair [3]: This is forked from `python-altair` and updated the version of it. [1] https://aur.archlinux.org/account/mhsekhavat/ [2] https://aur.archlinux.org/pkgbase/python-altair3/ [3] https://aur.archlinux.org/pkgbase/python-altair/