Bump tough-cookie from 4.1.2 to 4.1.3 in /example

Bumps [tough-cookie](https://github.com/salesforce/tough-cookie) from 4.1.2 to 4.1.3.
- [Release notes](https://github.com/salesforce/tough-cookie/releases)
- [Changelog](https://github.com/salesforce/tough-cookie/blob/master/CHANGELOG.md)
- [Commits](salesforce/tough-cookie@v4.1.2...v4.1.3)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>