build with pekko 1.1 jars #849

Job	Run time
Compile Benchmarks	1m 21s
Compile and test (2.12.19, 8)	4m 3s
Checks	2m 7s
Docs	2m 47s
Compile and test (2.12.19, 11)	3m 55s
Gradle tests	3m 27s
Compile and test (2.12.19, 17)	3m 58s
Maven tests	2m 41s
sbt scripted tests (gen-scala-server, 2.12)	8m 3s
Compile and test (2.13.13, 8)	4m 58s
sbt scripted tests (gen-java, 2.12)	3m 42s
Compile and test (2.13.13, 11)	4m 31s
Compile and test (2.13.13, 17)	4m 25s
Compile and test (3.3.3, 8)	4m 43s
Compile and test (3.3.3, 11)	4m 33s
Compile and test (3.3.3, 17)	4m 22s
	1h 3m 36s

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