build(deps): bump dexie from 2.0.4 to 3.2.2 in /demo

Bumps [dexie](https://github.com/dfahlander/Dexie.js) from 2.0.4 to 3.2.2.
- [Release notes](https://github.com/dfahlander/Dexie.js/releases)
- [Commits](dexie/Dexie.js@v2.0.4...v3.2.2)

---
updated-dependencies:
- dependency-name: dexie
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

demo/package-lock.json

@@ -55,7 +55,7 @@
     "create-react-class": "^15.6.3",
     "css-loader": "3.4.2",
     "deepcopy": "^0.6.3",
-    "dexie": "^2.0.0-rc.1",
+    "dexie": "^3.2.2",
     "dotenv": "8.2.0",
     "dotenv-expand": "5.1.0",
     "easemob-webrtc": "^3.2.2",