devel/py-pytest-timeout: Update to 1.3.3

Changelog:

https://bitbucket.org/pytest-dev/pytest-timeout/commits/d29ad5ecbf94ae609a0af7f34a9cc8a900f0c075

Reviewed by: koobs
Approved by: koobs (mentor)
Differential Revision: https://reviews.freebsd.org/D18620