Bump google.golang.org/protobuf from 1.30.0 to 1.33.0 in /docsgen #1170

Job	Run time
run-determination	1s
check-errors (./)	36s
check-errors (docsgen)	35s
check-errors (ruledocsgen)	33s
check-outdated (./)	20s
check-style (./)	17s
check-outdated (docsgen)	14s
check-style (docsgen)	15s
check-outdated (ruledocsgen)	20s
check-style (ruledocsgen)	19s
check-config (./)	18s
check-formatting (./)	13s
check-config (docsgen)	18s
check-formatting (docsgen)	16s
check-config (ruledocsgen)	20s
check-formatting (ruledocsgen)	17s
	5m 12s

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