net-mgmt/netbox: Relax RUN_DEPENDS

• The 2020Q1 branch has 0.24.0 of www/py-dj22-django-taggit thus relax its version requirement of the RUN_DEPENDS to avoid a build failure there.
  
  Although net-mgmt/netbox requires the 1.1.0 release of www/py-dj22-django-taggit (pinned with "==" by upstream), it runs fine with either 0.24.0 (in 2020Q1) or 1.2.0 (since r521999).

MFH: 2020Q1 (build fix blanket)