chore: update @types/restify to v8 (#401)

Author: DominicKramer

package.json

@@ -59,7 +59,7 @@
     "@types/node": "^12.0.8",
     "@types/once": "^1.4.0",
     "@types/proxyquire": "^1.3.28",
-    "@types/restify": "^7.2.11",
+    "@types/restify": "^8.0.0",
     "@types/uuid": "^3.4.4",
     "body-parser": "^1.19.0",
     "boom": "^7.3.0",