Reverse dependencies for UPnP

Latest version of the following gems require UPnP

Gem	Version	Date	Downloads
nlhue +9.66 Thousand Downloads	`0.2.0` March 07, 2021	March 07, 2021	9.66 Thousand
UPnP-MediaServer +6.01 Thousand Downloads	`1.0.0` July 23, 2008	July 23, 2008	6.01 Thousand
UPnP-ContentDirectory +5.83 Thousand Downloads	`1.0` July 23, 2008	July 23, 2008	5.83 Thousand
UPnP-ConnectionManager +5.71 Thousand Downloads	`1.0` July 23, 2008	July 23, 2008	5.71 Thousand