Bump xml2js and @azure/ms-rest-js in /tools/js-sdk-release-tools (#5956)

Bumps [xml2js](https://github.com/Leonidas-from-XIV/node-xml2js) and [@azure/ms-rest-js](https://github.com/Azure/ms-rest-js). These dependencies needed to be updated together.

Updates `xml2js` from 0.4.23 to 0.5.0
- [Release notes](https://github.com/Leonidas-from-XIV/node-xml2js/releases)
- [Commits](https://github.com/Leonidas-from-XIV/node-xml2js/commits/0.5.0)

Updates `@azure/ms-rest-js` from 2.6.2 to 2.6.6
- [Release notes](https://github.com/Azure/ms-rest-js/releases)
- [Changelog](https://github.com/Azure/ms-rest-js/blob/master/Changelog.md)
- [Commits](https://github.com/Azure/ms-rest-js/commits)

---
updated-dependencies:
- dependency-name: xml2js
  dependency-type: indirect
- dependency-name: "@azure/ms-rest-js"
  dependency-type: indirect
...

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