chore(deps): update dependency babel-plugin-istanbul to v7

| datasource | package               | from  | to    |
| ---------- | --------------------- | ----- | ----- |
| npm        | babel-plugin-istanbul | 5.2.0 | 7.0.0 |

Author: renovate[bot]

package.json

@@ -25,7 +25,7 @@
     "@types/react": "16.14.62",
     "@types/react-dom": "16.9.24",
     "babel-loader": "8.4.1",
-    "babel-plugin-istanbul": "5.2.0",
+    "babel-plugin-istanbul": "7.0.0",
     "babel-plugin-styled-components": "1.13.3",
     "concurrently": "5.3.0",
     "cypress": "3.8.3",