www/py-google-api-python-client: Change RUN_DEPENDS of DJANGO option

[kai]

Summary

* Switch the non-default DJANGO option from Django 1.11 (End-of-Life since
  April) to Django 2.2 (current LTS release).

  Because the port itself still has some Python 2.7 consumers and Django 2.2
  requires Python 3.5+, make the DJANGO option invisible when the port is built
  for Python 2.7.

* Bump PORTREVISION due changed dependencies.

PR: 247115
Reviewed: TBA

Test Plan

• FLAVOR=py27 make config -> DJANGO option not visible
• make config -> DJANGO option visible
• FLAVOR=py27 make -V RUN_DEPENDS with DJANGO option set -> www/py-django22 not present in RUN_DEPENDS
• make -V RUN_DEPENDS with DJANGO option set -> www/py-django22 present in RUN_DEPENDS
• poudriere bulk -n -a with/without DJANGO option set -> OK, no errors

[koobs]

www/py-google-api-python-client/Makefile

28–29

Why did we use a GROUP here?

40

Might we consider only adding the DJANGO option in the > 3.5 case ?

Might be a bit cleaner and explicit than the hoop jumping constructs needed to remove and option

[kai]

Abandon this revision because the workaround for Python 2.7 is no longer needed since rP559531.

At this point, thank you again @koobs for your time and feedback.