Gem version updates (#2566)
Gem version updates (#2566)

* Update autoprefixer-rails to version 6.7.7.2

* Update aws-sdk to version 2.9.12

* Update http to version 2.2.2

* Update mail to version 2.6.5

* Update pghero to version 1.6.5

* Update ox to version 2.4.13

* Update json to version 2.1.0

* Update capistrano-rbenv to version 2.1.1

* Update httplog to version 0.99.3

* Update rainbow to version 2.2.2

* Update pkg-config to version 1.2.0

* Update globalid to version 0.4.0

* Update redis-rack to version 2.0.2

* Update webmock to version 3.0.1

* Update oj to version 3.0.2

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