Bump tough-cookie and artillery in /test/load (#3154)

Bumps [tough-cookie](https://github.com/salesforce/tough-cookie) to 4.1.3 and updates ancestor dependency [artillery](https://github.com/artilleryio/artillery). These dependencies need to be updated together.


Updates `tough-cookie` from 2.5.0 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](https://github.com/salesforce/tough-cookie/compare/v2.5.0...v4.1.3)

Updates `artillery` from 1.7.2 to 2.0.0-34
- [Release notes](https://github.com/artilleryio/artillery/releases)
- [Commits](https://github.com/artilleryio/artillery/compare/v1.7.2...v2.0.0-34)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: artillery
  dependency-type: direct:production
...

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test/load/package.json

@@ -9,7 +9,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "artillery": "^1.7.2",
+    "artillery": "^2.0.0-34",
     "ws": "^7.4.6"
   }
 }