ScalaSteward: Update scala-library from 2.12.19 to 2.12.20 (#473) #324

Job	Run time
matrix_prep	3s
build_coverage / matrix_prep	3s
publish_doc / matrix_prep	3s
build_coverage / build (3.0, test-uploadReport, release)	1m 2s
build_coverage / build (3.1, test-uploadReport, release)	1m 13s
build_coverage / build (3.2, test-uploadReport, release)	1m 5s
build_coverage / build (3.3, test-uploadReport, release)	1m 18s
build_coverage / build (3.4, test-uploadReport, release)	1m 6s
build_coverage / build (3.5, test-uploadReport, release)	1m 3s
publish_doc / scaladoc_api (3.0, test-uploadReport, release)	1m 30s
publish_doc / scaladoc_api (3.1, test-uploadReport, release)	1m 33s
publish_doc / scaladoc_api (3.2, test-uploadReport, release)	1m 52s
publish_doc / scaladoc_api (3.3, test-uploadReport, release)	2m 5s
publish_doc / scaladoc_api (3.4, test-uploadReport, release)	1m 59s
publish_doc / scaladoc_api (3.5, test-uploadReport, release)	1m 59s
publish_doc / generate_publish_mdoc	1m 34s
mvn_release	0s
	19m 28s

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