chore: upgrade jest for security (#35)

Author: Naturalclar

package.json

@@ -48,7 +48,7 @@
     "babel-plugin-module-resolver": "^3.2.0",
     "eslint": "^6.8.0",
     "flow-bin": "0.105.2",
-    "jest": "^25.1.0",
+    "jest": "^26.0.1",
     "metro-react-native-babel-preset": "0.53.1",
     "react": "16.8.3",
     "react-native": "^0.61.5",