Update scala-library to 2.12.20 in series/0.6.x #1215

Job	Run time
Generate Site (ubuntu-latest, temurin@11)	2m 33s
Generate coverage report (2.13 JVM only) (ubuntu-latest, temurin@11)	2m 49s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkJS)	6m 49s
Submit Dependencies	0s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkJVM)	4m 55s
Validate Steward Config (ubuntu-latest, temurin@11)	8s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkNative)	5m 58s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkJS)	5m 40s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkJVM)	4m 48s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkNative)	6m 6s
Build and Test (ubuntu-latest, 3, temurin@11, skunkJS)	6m 7s
Build and Test (ubuntu-latest, 3, temurin@11, skunkJVM)	3m 54s
Build and Test (ubuntu-latest, 3, temurin@11, skunkNative)	6m 41s
Publish Artifacts	0s
	56m 28s

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