Bug#912389: snakeyaml FTBFS with OpenJDK 11

[Adrian Bunk]

Source: snakeyaml
Version: 1.21-1
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/snakeyaml.html

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[ERROR] Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.013 s <<< FAILURE! - in org.yaml.snakeyaml.generics.ObjectValuesTest
[ERROR] testObjectValuesWithParam(org.yaml.snakeyaml.generics.ObjectValuesTest)  Time elapsed: 0.01 s  <<< FAILURE!
junit.framework.AssertionFailedError: class [Ljava.lang.Object; cannot be cast to class [Ljava.lang.String; ([Ljava.lang.Object; and [Ljava.lang.String; are in module java.base of loader 'bootstrap')
	at org.yaml.snakeyaml.generics.ObjectValuesTest.testObjectValuesWithParam(ObjectValuesTest.java:93)