build

Update logback-classic, logback-core to 1.5.15 #7155

Job	Run time
build-mdbook	7s
compiler-warnings	2m 23s
integration-tests (ubuntu-latest, oopsla19)	18m 40s
format-check	6m 36s
integration-tests (ubuntu-latest, arrays)	14m 56s
scaladoc-check	3m 1s
integration-tests (macos-latest, oopsla19)	23m 12s
unit-tests (ubuntu-latest)	5m 36s
unit-tests (macos-latest)	4m 14s
docker-tests	20m 34s
	1h 39m 19s

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