chore(deps): update dependency dotenv to v9

Author: renovate-bot

package-lock.json

@@ -14,7 +14,7 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-2": "6.24.1",
     "chai": "4.3.4",
-    "dotenv": "8.6.0",
+    "dotenv": "9.0.0",
     "eslint": "7.25.0",
     "eslint-plugin-babel": "5.3.1",
     "istanbul": "0.4.5",