fix JRuby SAX parser entity handling (v1.12.x backport) #2329
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What problem is this PR intended to solve?
GHSA-2rr5-8q37-2w7h (may be private for now)
This is a backport of #2328 for a v1.12.x patch release.
Have you included adequate test coverage?
Yes.
Does this change affect the behavior of either the C or the Java implementations?
The Java implementation behavior now matches the C implementation behavior.