Build and test Pekko with Scala 3 #357

Job	Run time
Test (testkit/test actor-tests/test)	8m 23s
Test (actor-testkit-typed/test actor-typed-tests/test)	7m 20s
Test (bench-jmh/test)	7m 33s
Test (cluster/test cluster-tools/test cluster-typed/test distributed-data/test cluster-metrics/te...	22m 18s
Test (discovery/test coordination/test)	4m 8s
Test (persistence/test persistence-shared/test persistence-query/test persistence-typed/test pers...	15m 48s
Test (pki/test slf4j/test)	3m 3s
Test (serialization-jackson/test)	5m 36s
Test (stream/test stream-testkit/test stream-tests/test stream-typed/test stream-typed-tests/test)	21m 2s
Test (stream-tests-tck/test)	7m 20s
Test (remote/test remote-tests/test protobuf-v3/test)	12m 13s
	1h 54m 44s

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