test: runas is not an optional dependency (#14704)

spec/package.json

@@ -18,14 +18,12 @@
     "mocha-multi-reporters": "^1.1.7",
     "multiparty": "^4.1.4",
     "q": "^1.5.1",
+    "runas": "3.x",
     "send": "^0.16.2",
     "temp": "^0.8.3",
     "walkdir": "0.0.12",
     "winreg": "^1.2.4",
     "ws": "^5.2.0",
     "yargs": "^11.0.0"
-  },
-  "optionalDependencies": {
-    "runas": "3.x"
   }
 }