bump: logback-classic 1.5.12 (was 1.5.8) #1505

Job	Run time
Checks	4m 57s
Compile and test (2.13)	9m 23s
Compile Benchmarks	5m 23s
Gradle tests	12m 55s
Compile and test (3.3)	8m 31s
Maven tests	9m 19s
sbt scripted tests (gen-scala-server, 2.13)	11m 13s
sbt scripted tests (gen-java, 2.13)	7m 28s
sbt scripted tests (scala-2_13, 2.13)	6m 45s
sbt scripted tests (scala3, 3.3)	7m 22s
	1h 23m 16s

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