fix: package.json to reduce vulnerabilities

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

Author: snyk-bot

package.json

@@ -59,7 +59,7 @@
     "mkpath": "^1.0.0",
     "node-version-compare": "^1.0.3",
     "plist": "^3.0.5",
-    "shelljs": "^0.8.5",
+    "shelljs": "^0.9.0",
     "xcode": "^3.0.1",
     "xml2js": "^0.4.23"
   },