Update scalafmt-core to 3.9.3 #1108

Job	Run time
Checks	11m 8s
Compile and test (2.12.20, 8)	3m 50s
Compile Benchmarks	1m 10s
Compile and test (2.12.20, 11)	3m 51s
Docs	2m 16s
Compile and test (2.12.20, 17)	3m 48s
Gradle tests	3m 15s
Compile and test (2.12.20, 21)	3m 22s
Maven tests	2m 33s
Compile and test (2.13.16, 8)	7m 36s
sbt scripted tests (gen-scala-server, 2.12)	17m 12s
sbt scripted tests (gen-java, 2.12)	3m 31s
Compile and test (2.13.16, 11)	4m 26s
Compile and test (2.13.16, 17)	4m 2s
Compile and test (2.13.16, 21)	6m 56s
Compile and test (3.3.5, 8)	4m 34s
Compile and test (3.3.5, 11)	4m 23s
Compile and test (3.3.5, 17)	4m 15s
Compile and test (3.3.5, 21)	3m 55s
	1h 36m 3s

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