Bump tmp and artillery in /test/load (#4639)

Removes [tmp](https://github.com/raszi/node-tmp). It's no longer used after updating ancestor dependency [artillery](https://github.com/artilleryio/artillery). These dependencies need to be updated together.


Removes `tmp`

Updates `artillery` from 2.0.22 to 2.0.26
- [Release notes](https://github.com/artilleryio/artillery/releases)
- [Commits](https://github.com/artilleryio/artillery/compare/artillery-2.0.22...artillery-2.0.26)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 
  dependency-type: indirect
- dependency-name: artillery
  dependency-version: 2.0.26
  dependency-type: direct:production
...

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test/load/package.json

@@ -9,7 +9,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "artillery": "^2.0.22",
+    "artillery": "^2.0.26",
     "ws": "^7.5.10"
   }
 }