🤖 chore: Add cover key in .babel.env.

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  - https://github.com/aureooms/rejuvenate/blob/1fe650dc2407c6c6395828a28777fe8137a3bd2f/src/transforms/package.json:ensure-babel-env-cover.js
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Author: a-flying-potato

package.json

@@ -118,6 +118,7 @@
           ]
         ]
       },
+      "cover": {},
       "development": {
         "sourceMaps": "inline",
         "presets": [