Update scalatest to 3.2.19 (#340) #883

Job	Run time
Docs	2m 27s
Checks	1m 58s
Compile Benchmarks	1m 14s
Compile and test (2.12.19, 8)	3m 38s
Compile and test (2.12.19, 11)	3m 28s
Gradle tests	3m 3s
Maven tests	2m 49s
Compile and test (2.12.19, 17)	3m 37s
sbt scripted tests (gen-scala-server, 2.12)	6m 39s
Compile and test (2.13.14, 8)	4m 18s
sbt scripted tests (gen-java, 2.12)	3m 18s
Compile and test (2.13.14, 11)	4m 5s
Compile and test (2.13.14, 17)	4m 2s
Compile and test (3.3.3, 8)	4m 25s
Compile and test (3.3.3, 11)	4m 7s
Compile and test (3.3.3, 17)	3m 58s
	57m 6s

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