Bump tough-cookie, azure-iot-device and azure-iot-device-mqtt

Removes [tough-cookie](https://github.com/salesforce/tough-cookie). It's no longer used after updating ancestor dependencies [tough-cookie](https://github.com/salesforce/tough-cookie), [azure-iot-device](https://github.com/Azure/azure-iot-sdk-node) and [azure-iot-device-mqtt](https://github.com/Azure/azure-iot-sdk-node). These dependencies need to be updated together.


Removes `tough-cookie`

Updates `azure-iot-device` from 1.9.9 to 1.18.2
- [Release notes](https://github.com/Azure/azure-iot-sdk-node/releases)
- [Commits](https://github.com/Azure/azure-iot-sdk-node/commits)

Updates `azure-iot-device-mqtt` from 1.9.9 to 1.16.2
- [Release notes](https://github.com/Azure/azure-iot-sdk-node/releases)
- [Commits](https://github.com/Azure/azure-iot-sdk-node/commits)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: azure-iot-device
  dependency-type: direct:production
- dependency-name: azure-iot-device-mqtt
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -18,8 +18,8 @@
   },
   "homepage": "https://github.com/Azure/iot-edge-testing-utility#readme",
   "dependencies": {
-    "azure-iot-device": "^1.9.9",
-    "azure-iot-device-mqtt": "^1.9.9",
+    "azure-iot-device": "^1.18.2",
+    "azure-iot-device-mqtt": "^1.16.2",
     "body-parser": "^1.18.2",
     "express": "^4.16.3",
     "fs-extra": "^5.0.0",