Update protoc-gen to 0.9.8 (#1782) #2347

Job	Run time
conformance	1m 52s
build (2_12, e2e)	3m 43s
build (2_12, test)	9m 36s
build (2_13, e2e)	4m 11s
build (2_13, test)	12m 0s
build (3, e2e)	4m 32s
build (3, test)	9m 41s
build (2_12, examples_and_formatting)	2m 41s
build (2_13, scala3_compat_test)	8m 45s
build (3, scala3_compat_test)	7m 13s
ci-passed	1s
	1h 4m 15s

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