fix: upgrade @babel/preset-env from 7.5.0 to 7.8.4

Snyk has created this PR to upgrade @babel/preset-env from 7.5.0 to 7.8.4.

See this package in NPM:
https://www.npmjs.com/package/@babel/preset-env

See this project in Snyk:
https://app.snyk.io/org/bluewallet/project/4d0df22a-0152-410a-8584-6df0d0a596d4?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -52,7 +52,7 @@
     ]
   },
   "dependencies": {
-    "@babel/preset-env": "7.5.0",
+    "@babel/preset-env": "7.8.4",
     "@react-native-community/async-storage": "1.6.2",
     "@react-native-community/blur": "3.4.1",
     "@react-native-community/slider": "2.0.8",