the pr to update the syn for Rust parser, but it has not been merged

https://github.com/fkling/astexplorer/blame/ebfd87a60880d03ffc97c1d6799a24a27feeab27/website/package.json#L66C21-L66C21

The "astexplorer-syn" updated version is: "^2.0.15". The new version has modified the internal fields.

Start at website/package.json line 66, where the astexplorer-syn dependency version is declared, and inspect the Rust parser integration that depends on its internal fields. Update the dependency and verify that the parser still handles the changed fields correctly; the issue does not name a test or a specific integration file.

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