Update scalafmt-core to 3.9.9 #558

Job	Run time
Build and Test (ubuntu-latest, 2.12.20, zulu@8)	1m 29s
Build and Test (ubuntu-latest, 2.13.16, zulu@8)	1m 29s
Build and Test (ubuntu-latest, 3.3.4, zulu@8)	1m 28s
Publish Artifacts	-1s
	4m 25s

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