Update `tree-sitter-java` dependency to 0.20.2

[NinoScript]

Version 0.20.0 of tree-sitter-java has some bugs that have been fixed in 0.20.2
It would be ideal to use the latest patch version

(0.20.2 has some breaking changes though, so I understand why it was fixed to 0.20.0 in 1449ad4)