chore(deps): update google-protobuf requirement from ~> 3.17 to >= 3.17, < 5.0 in /fluent-plugin-protobuf #987

Job	Run time
image-test-alpine	1m 28s
test-fluent-plugin-enhance-k8s-metadata	23s
test-fluent-plugin-datapoint	18s
image-test-debian	1m 44s
test-fluent-plugin-events	39s
test-fluent-plugin-kubernetes-metadata-filter	1m 15s
test-fluent-plugin-prometheus-format	15s
test-fluent-plugin-kubernetes-sumologic	14s
test-fluent-plugin-protobuf	22s
	6m 38s

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