Update slf4j-api to 2.0.12 #756

Job	Run time
Checks	4m 0s
Compile and test (2.12.19, 8)	3m 56s
Compile Benchmarks	3m 28s
Compile and test (2.12.19, 11)	3m 37s
Compile and test (2.12.19, 17)	3m 47s
Compile and test (2.13.13, 8)	4m 14s
sbt scripted tests (gen-scala-server, 2.12)	8m 13s
Compile and test (2.13.13, 11)	4m 20s
sbt scripted tests (gen-java, 2.12)	3m 34s
Compile and test (2.13.13, 17)	4m 17s
Docs	4m 57s
Compile and test (3.3.3, 8)	4m 38s
Maven tests	4m 44s
Compile and test (3.3.3, 11)	4m 45s
Gradle tests	3m 23s
Compile and test (3.3.3, 17)	4m 11s
	1h 10m 4s

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