Bump node-fetch and @c8y/client (#10)

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) to 2.6.7 and updates ancestor dependency @c8y/client. These dependencies need to be updated together.


Updates `node-fetch` from 2.1.1 to 2.6.7
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.1.1...v2.6.7)

Updates `@c8y/client` from 1013.0.291 to 1013.168.0

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: "@c8y/client"
  dependency-type: direct:production
...

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tristan Bastian <tristan.bastian@softwareag.com>

package.json

@@ -20,7 +20,7 @@
     "lint:with-warns": "tsc --noEmit && eslint . --ext js,ts,json --fix"
   },
   "dependencies": {
-    "@c8y/client": "^1013.0.291",
+    "@c8y/client": "^1013.168.0",
     "dotenv": "^8.2.0",
     "express": "^4.17.1",
     "generate-password": "^1.7.0",