Should `sideEffects` be boolean `false` ? esbuild is complaining about it since the 128.0.0 release:

Should `sideEffects` be boolean `false` ? esbuild is complaining about it since the 128.0.0 release:

```
▲ [WARNING] The value for "sideEffects" must be a boolean or an array [package.json]

./node_modules/googleapis/package.json:9:17:
9 │ "sideEffects": "false",
╵ ^

1 warning
```

[Webpack documents it](https://webpack.js.org/guides/tree-shaking/#mark-the-file-as-side-effect-free) similarly as `boolean | string[]`

_Originally posted by @mhio in https://github.com/googleapis/google-api-nodejs-client/issues/3354#issuecomment-1776999824_