www/seahub: Add missing depend

[ultima]

Summary

• Added py-requests to runtime depends

Reported by\: Carsten Lohrmann
Reviewed by\: lifanov (mentor), matthew (mentor)
Approved by\: lifanov (mentor), matthew (mentor)
Differential Revision\: https://reviews.freebsd.org/DXXXXX

Test Plan

portlint:
WARN: Makefile: [0]: possible direct use of command "file" found. use ${FILE} instead.
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
0 fatal errors and 2 warnings found.

[lifanov]

You need to bump the port revision for dependency changes.

[ultima]

Revision bump, sorry about that I had thought adding depends did not require bump.

[ultima]

The reporter wants to keep email address private, so omitting that bit.

[matthew]