Don't use loose mode in @babel/plugin-transform-spread

In
[`loose`](https://babeljs.io/docs/babel-plugin-transform-spread#loose)
mode, this plugin treats all iterables as arrays. This was causing
issues when compiling Zod (inlined into babel-plugin-react-compiler),
causing it to have a single element of `undefined: undefined` which
violates the zod schema

Note the spread below in Zod which was being transformed incorrectly:

```js
const pairs = [...ctx.data.entries()].map(([key2, value], index) => {
  return {
    key: keyType._parse(new ParseInputLazyPath(ctx, key2, ctx.path, [index, "key"])),
    value: valueType._parse(new ParseInputLazyPath(ctx, value, ctx.path, [index, "value"]))
  };
});
```

babel.config.js

@@ -19,7 +19,7 @@ module.exports = {
     '@babel/plugin-transform-shorthand-properties',
     '@babel/plugin-transform-computed-properties',
     '@babel/plugin-transform-for-of',
-    ['@babel/plugin-transform-spread', {loose: true, useBuiltIns: true}],
+    ['@babel/plugin-transform-spread', {useBuiltIns: true}],
     '@babel/plugin-transform-parameters',
     ['@babel/plugin-transform-destructuring', {loose: true, useBuiltIns: true}],
     ['@babel/plugin-transform-block-scoping', {throwIfClosureRequired: true}],