Bump expo from 31.0.6 to 48.0.0 in /demos/reactnative

Bumps [expo](https://github.com/expo/expo/tree/HEAD/packages/expo) from 31.0.6 to 48.0.0.
- [Changelog](https://github.com/expo/expo/blob/main/packages/expo/CHANGELOG.md)
- [Commits](https://github.com/expo/expo/commits/HEAD/packages/expo)

---
updated-dependencies:
- dependency-name: expo
  dependency-version: 48.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demos/reactnative/package.json

@@ -9,7 +9,7 @@
     "eject": "expo eject"
   },
   "dependencies": {
-    "expo": "^31.0.2",
+    "expo": "^48.0.0",
     "react": "16.5.0",
     "react-native": "https://github.com/expo/react-native/archive/sdk-31.0.0.tar.gz",
     "tus-js-client": "file:../../"