fix: src/gen/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AJV-584908
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908

Author: snyk-bot

src/gen/package.json

@@ -17,7 +17,7 @@
         "request": "^2.81.0",
         "@types/bluebird": "3.5.33",
         "@types/request": "*",
-        "rewire": "^4.0.0"
+        "rewire": "^5.0.0"
     },
     "devDependencies": {
         "typescript": "^2.4.2",