chore(deps): update google-protobuf requirement from ~> 3.17 to >= 3.17, < 5.0 in /fluent-plugin-protobuf #967

Job	Run time
image-test-alpine	1m 33s
test-fluent-plugin-datapoint	16s
test-fluent-plugin-enhance-k8s-metadata	22s
image-test-debian	1m 48s
test-fluent-plugin-events	32s
test-fluent-plugin-kubernetes-metadata-filter	1m 13s
test-fluent-plugin-kubernetes-sumologic	15s
test-fluent-plugin-prometheus-format	15s
test-fluent-plugin-protobuf	21s
	6m 35s

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