Update gems (major)

This MR contains the following updates:

Package	Type	Update	Change
faraday	ironbank-rubygems	major	1.9.3 -> 2.2.0
faraday-httpclient	ironbank-rubygems	major	1.0.1 -> 2.0.1
faraday-net_http	ironbank-rubygems	major	1.0.1 -> 2.0.1
faraday-net_http_persistent	ironbank-rubygems	major	1.2.0 -> 2.0.1
faraday-patron	ironbank-rubygems	major	1.0.0 -> 2.0.1
http	ironbank-rubygems	major	4.4.1 -> 5.0.4
http-accept	ironbank-rubygems	major	1.7.0 -> 2.1.1
prometheus-client	ironbank-rubygems	major	2.1.0 -> 3.0.0

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