Update scalatest to 3.2.19 #881

Job	Run time
Docs	2m 16s
Compile Benchmarks	1m 6s
Compile and test (2.12.19, 8)	3m 54s
Checks	1m 38s
Compile and test (2.12.19, 11)	3m 33s
Gradle tests	2m 58s
Compile and test (2.12.19, 17)	3m 40s
Maven tests	2m 35s
Compile and test (2.13.14, 8)	4m 14s
sbt scripted tests (gen-scala-server, 2.12)	8m 12s
Compile and test (2.13.14, 11)	3m 54s
sbt scripted tests (gen-java, 2.12)	3m 31s
Compile and test (2.13.14, 17)	4m 7s
Compile and test (3.3.3, 8)	4m 23s
Compile and test (3.3.3, 11)	4m 17s
Compile and test (3.3.3, 17)	4m 18s
	58m 36s

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