add pekko-grpc link #1895

Job	Run time
conformance	2m 2s
build (2_12, mima)	1m 28s
build (2_12, e2e)	6s
build (2_12, test)	10m 39s
build (2_13, mima)	1m 54s
build (2_13, e2e)	5s
build (2_13, test)	12m 41s
build (3, mima)	11s
build (3, e2e)	5s
build (3, test)	10m 48s
build (2_12, examples_and_formatting)	3m 41s
build (2_13, scala3_compat_test)	14m 29s
build (3, scala3_compat_test)	15m 52s
ci-passed	2s
	1h 14m 3s

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