use addPekkoModuleDependency (#383) #975

Job	Run time
Checks	2m 16s
Docs	3m 18s
Compile and test (2.12.20, 8)	4m 6s
Compile Benchmarks	1m 44s
Compile and test (2.12.20, 11)	4m 17s
Gradle tests	3m 1s
Maven tests	2m 41s
Compile and test (2.12.20, 17)	4m 22s
sbt scripted tests (gen-scala-server, 2.12)	8m 18s
Compile and test (2.12.20, 21)	3m 52s
sbt scripted tests (gen-java, 2.12)	4m 7s
Compile and test (2.13.15, 8)	4m 33s
Compile and test (2.13.15, 11)	5m 3s
Compile and test (2.13.15, 17)	4m 49s
Compile and test (2.13.15, 21)	4m 24s
Compile and test (3.3.4, 8)	4m 37s
Compile and test (3.3.4, 11)	4m 57s
Compile and test (3.3.4, 17)	5m 2s
Compile and test (3.3.4, 21)	4m 39s
	1h 20m 6s

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