gz-rendering7 7.0.0~pre1 (#2028)
gz-rendering7 7.0.0~pre1 (#2028)

* gz-rendering7: update 7.0.0~pre1

* update  bottle.

Co-authored-by: Steve Peters <19cdd629ec3b4ea4663c77a4169548f370fdc02f@openrobotics.org>
osrf/homebrew-simulation