Update gems

This MR contains the following updates:

Package	Type	Update	Change
bundler	ironbank-rubygems	patch	2.2.30 -> 2.2.31
fluent-plugin-elasticsearch	ironbank-rubygems	patch	5.1.1 -> 5.1.2
fluent-plugin-kubernetes_metadata_filter	ironbank-rubygems	patch	2.9.1 -> 2.9.2

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