fix: packages/twilio-run/package.json to reduce vulnerabilities (#475)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-YAML-5458867

Co-authored-by: snyk-bot <[email protected]>

Author: twilio-product-security

packages/twilio-run/package.json

@@ -48,7 +48,7 @@
     "columnify": "^1.5.4",
     "common-tags": "^1.8.0",
     "conf": "^5.0.0",
-    "cosmiconfig": "^7.0.0",
+    "cosmiconfig": "^8.0.0",
     "debug": "^3.1.0",
     "dotenv": "^6.2.0",
     "enquirer": "^2.3.6",