Updates language-support package type and node version

[anderson4j]

The problem:
Running e2e tests in the react-codemirror package fails on main with a message like:
SyntaxError: Named export 'testData' not found. The requested module '@neo4j-cypher/language-support' is a CommonJS module, which may not support all module.exports as named exports.
This testData file is part of the language-support package, and we use an ESModule import to access it in the react-codemirror tests.

The fix:
Adding "type": "module" in the package.json of language-support makes it so .js files (the ones we build with the build-esm-and-types script) are treated as ESModule instead of CommonJS.
In the build-commonjs script the output file is already .cjs instead of .js so this should not interfere with the actual CommonJS file.

The node version we were using was also a bit old, and Oskar had suggested updating it, so I shifted it to LTS.

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Latest commit: d04142c

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