Log Message:
devel/ruby-mixlib-config: update to 3.0.9

Update devel/ruby-mixlib-config package to 3.0.9.

3.0.9 (2020-08-13)

* Remove encoding comment + pin chefstyle #81 (tas50)
* Update chefstyle requirement from = 1.2.0 to 1.2.1 #82
  (dependabot-preview[bot])
* Optimize requires for non-omnibus installs #83 (tas50)