Unsupported greater that ES2017

Reactor sandbox use [match-requires](https://www.npmjs.com/package/match-requires) which indirectly use [babylon](https://www.npmjs.com/package/babylon), an old version of [@babel/parser](https://www.npmjs.com/package/@babel/parser) which support only ES2017 syntax.
Reactor build system however support newer version at least ES2020 or ES2021 (I'm not sure, I didn't find any documentation about it).
While the extension use a syntax like async iterator, optional chaining, nullish coalescing, etc. use the sandbox is no more possible.

### Expected Behaviour

Be able to write extension with minium of ES2021 code

### Actual Behaviour

An error is throw about invalid syntax.

### Reproduce Scenario (including but not limited to)

Use ES2021 code, then execute `reactor-sandbox`

### Workaround

I found a way to force to use a newer version of babel parser by overriding sandbox dependencies:
```json
{
"overrides": {
"@adobe/reactor-sandbox@^14.0.0": {
"match-requires": {
"strip-comments": {
"babel-extract-comments": {
"babylon": "npm:@babel/parser@^8.0.4"
}
}
}
}
}
}
```

Start by tracing the `reactor-sandbox` execution path and its `match-requires` dependency to the old `babylon` parser. Verify which parser version is resolved, then run the reported ES2021 syntax examples; done means extensions using async iterators, optional chaining, and nullish coalescing no longer fail with syntax errors.

Written by the indexing model from the issue text.