fix: upgrade react-redux from 7.2.8 to 7.2.9

Snyk has created this PR to upgrade react-redux from 7.2.8 to 7.2.9.

See this package in npm:
https://www.npmjs.com/package/react-redux

See this project in Snyk:
https://app.snyk.io/org/nexuscompute/project/3295247b-14f9-44b5-84b4-8f5b949cc907?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

demo/package.json

@@ -35,7 +35,7 @@
     "mobx-state-tree": "^3.16.0",
     "preact-render-to-string": "^5.0.2",
     "preact-router": "^3.0.0",
-    "react-redux": "^7.1.0",
+    "react-redux": "^7.2.9",
     "react-router": "^5.0.1",
     "react-router-dom": "^5.0.1",
     "redux": "^4.0.1",