Fix @babel/preset-env version

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

dashboard/package.json

@@ -31,7 +31,7 @@
     "@babel/plugin-proposal-object-rest-spread": "^7.8.3",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
     "@babel/plugin-transform-runtime": "^7.6.2",
-    "@babel/preset-env": "^7.8.7",
+    "@babel/preset-env": "=7.9.0",
     "@babel/preset-react": "^7.7.0",
     "@babel/preset-typescript": "^7.8.3",
     "@babel/runtime": "^7.7.2",