fix: example/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AXIOS-6671926

Author: snyk-bot

example/package.json

@@ -16,7 +16,7 @@
     "@react-native-community/masked-view": "^0.1.10",
     "@react-navigation/native": "^5.7.2",
     "@react-navigation/stack": "^5.8.0",
-    "appium": "^1.18.3",
+    "appium": "^2.12.2",
     "react": "16.13.1",
     "react-native": "0.63.2",
     "react-native-gesture-handler": "^1.7.0",