chore(deps): bump concurrent-ruby from 1.2.2 to 1.2.3 in /fluent-plugin-enhance-k8s-metadata #930

Job	Run time
image-test-alpine	1m 19s
image-test-debian	1m 20s
test-fluent-plugin-enhance-k8s-metadata	22s
test-fluent-plugin-datapoint	16s
test-fluent-plugin-events	30s
test-fluent-plugin-kubernetes-metadata-filter	1m 10s
test-fluent-plugin-kubernetes-sumologic	17s
test-fluent-plugin-prometheus-format	14s
test-fluent-plugin-protobuf	18s
	5m 46s

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