Update babel monorepo to v7.15.8

Author: renovate-bot

package.json

@@ -53,8 +53,8 @@
     ]
   },
   "devDependencies": {
-    "@babel/core": "7.9.0",
-    "@babel/preset-env": "7.9.0",
+    "@babel/core": "7.15.8",
+    "@babel/preset-env": "7.15.8",
     "babel-eslint": "10.1.0",
     "babel-jest": "25.2.3",
     "eslint": "6.8.0",