build

Update logback-classic, logback-core to 1.4.14 #6446

Job	Run time
docker-tests	19m 39s
build-mdbook	6s
compiler-warnings	2m 11s
format-check	3m 46s
integration-tests (ubuntu-latest, oopsla19)	17m 8s
scaladoc-check	2m 57s
integration-tests (ubuntu-latest, arrays)	8m 58s
unit-tests (ubuntu-latest)	7m 51s
unit-tests (macos-latest)	15m 54s
integration-tests (macos-latest, oopsla19)	29m 24s
	1h 47m 54s

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