Bump tough-cookie and @microsoft.azure/autorest.testserver (#2938)

Removes [tough-cookie](https://github.com/salesforce/tough-cookie). It's no longer used after updating ancestor dependency [@microsoft.azure/autorest.testserver](https://github.com/Azure/autorest.testserver). These dependencies need to be updated together.


Removes `tough-cookie`

Updates `@microsoft.azure/autorest.testserver` from 3.3.49 to 3.3.50
- [Changelog](https://github.com/Azure/autorest.testserver/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Azure/autorest.testserver/commits)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: "@microsoft.azure/autorest.testserver"
  dependency-type: direct:development
...

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