chore(deps): update dependency c8 to v9 (#736)

Author: renovate-bot

package.json

@@ -50,7 +50,7 @@
     "@types/restify": "^8.0.0",
     "@types/uuid": "^9.0.0",
     "boom": "^7.3.0",
-    "c8": "^8.0.1",
+    "c8": "^9.0.0",
     "codecov": "^3.5.0",
     "express": "^4.17.1",
     "gts": "^5.0.0",