[steal] steal vulnerable to Prototype Pollution via requestedVersion variable

Prototype pollution vulnerability in function convertLater in npm-convert.js in stealjs steal via the requestedVersion variable in the npm-convert.js file.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-37257
• https://github.com/stealjs/steal/issues/1526
• https://github.com/stealjs/steal/blob/c9dd1eb19ed3f97aeb93cf9dcea5d68ad5d0ced9/ext/npm-convert.js#L362
• https://github.com/stealjs/steal/blob/c9dd1eb19ed3f97aeb93cf9dcea5d68ad5d0ced9/ext/npm-convert.js#L371
• https://github.com/advisories/GHSA-93q5-3xpc-8vg3