MFH: r562572

www/py-django-classy-tags: Prevent installation of test suite at top-level

• Add a workaround to prevent the installation of the test suite into Python's site-lib directory at top-level.

• Bump PORTREVISION due changed package contents.

PR: 252974
Approved by: cs (maintainer)

Approved by: ports-secteam (implicit, packaging fix blanket)