antlr4
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fix: Suppress this-escape warning in generated Parser introduced in JDK 21
This fixes https://github.com/antlr/antlr4/issues/4485
@parrt FYI: The bug report https://github.com/antlr/antlr4/issues/4341 was only partially fixed by https://github.com/antlr/antlr4/pull/4394 . This pull request fixes the missing part for that issue.
Gentle ping to @parrt, this is ready for review.