Update gems

This MR contains the following updates:

Package	Type	Update	Change
elasticsearch (source, changelog)	ironbank-rubygem	minor	7.7.0 -> 7.8.1
fluent-plugin-kubernetes_metadata_filter		minor	~> 2.3.0 -> ~> 2.5.0
fluent-plugin-prometheus		minor	~> 1.6.1 -> ~> 1.8.0
fluent-plugin-record-modifier		minor	~> 2.0.0 -> ~> 2.1.0
fluent-plugin-rewrite-tag-filter		minor	~> 2.2.0 -> ~> 2.3.0
fluentd		patch	1.11.1 -> 1.11.2
oj		minor	3.8.1 -> 3.10.8

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