ScalaSteward: Update scala-collection-compat from 2.11.0 to 2.12.0 #939

Job	Run time
Check Dependencies	7s
context_dump	5s
check_mdoc	1m 28s
build / matrix_prep	1s
build / build	0s
check_scaladoc / matrix_prep	11s
check_scaladoc / scaladoc_api (3.0, test-uploadReport, release)	2m 9s
check_scaladoc / scaladoc_api (3.1, test-uploadReport, release)	1m 44s
check_scaladoc / scaladoc_api (3.2, test-uploadReport, release)	2m 25s
check_scaladoc / scaladoc_api (3.3, test-uploadReport, release)	2m 0s
check_scaladoc / scaladoc_api (3.4, test-uploadReport, release)	1m 58s
check_scaladoc / scaladoc_api (3.5, test-uploadReport, release)	2m 8s
check_scaladoc / generate_publish_mdoc	0s
ci_ok	0s
	14m 16s

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