Update gems

This MR contains the following updates:

Package	Type	Update	Change
elasticsearch	ironbank-rubygems	minor	7.14.1 -> 7.15.0
elasticsearch-api	ironbank-rubygems	minor	7.14.1 -> 7.15.0
elasticsearch-transport	ironbank-rubygems	minor	7.14.1 -> 7.15.0
elasticsearch-xpack	ironbank-rubygems	minor	7.14.1 -> 7.15.0
faraday	ironbank-rubygems	minor	1.7.2 -> 1.8.0
fluent-plugin-kubernetes_metadata_filter	ironbank-rubygems	minor	2.8.0 -> 2.9.0
fluent-plugin-kubernetes_metadata_filter		minor	~> 2.8.0 -> ~> 2.9.0

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