sci-mathematics/pari-data: new version to force mirror of new tarballs.

sci-mathematics/pari-data: new version to force mirror of new tarballs.

There are new versions of these databases, but upstream modifies the
(unversioned) tarballs for them in-place when that happens. We tag
the distfiles with the package version, however, so this new version
should force new copies of everything to be mirrored.

In addition, I've used https in HOMEPAGE and SRC_URI, and have updated
the ebuild from EAPI=4 to EAPI=7.

Closes: https://bugs.gentoo.org/703146
Package-Manager: Portage-2.3.79, Repoman-2.3.16
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>