[Snyk] Security upgrade react-native from 0.84.0 to 0.85.0 (#50)

### Description

Bumps `react-native` from `0.84.0` to `0.85.0` in the example app to fix
a medium-severity vulnerability
([SNYK-JS-INFLIGHT-6095116](https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116):
Missing Release of Resource after Effective Lifetime in the transitive
\`inflight\` dependency).

This PR was originally created by Snyk. The \`yarn.lock\` has been
updated to match.

### Testing

- Dependency-only change in the example app; no behaviour changes.
- CI lint, typecheck, and test suite pass.

### Security Review

> [!IMPORTANT]
> A security review is required for every PR in this repository to
comply with PCI requirements.

- [x] I have considered and reviewed security implications of this PR
and included the summary below.

#### Security Impact Summary

This PR upgrades a transitive dependency (`inflight`) that had a
resource leak vulnerability. No payment flows, authentication logic,
user data handling, or external integrations are changed. The upgrade
only affects the example app's dependency tree, not the SDK itself.

---------

Co-authored-by: snyk-io[bot] <141718529+snyk-io[bot]@users.noreply.github.com>
Co-authored-by: RhysAtBolt <rstewart@bolt.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 3 people

example/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "react": "19.2.3",
-    "react-native": "0.84.0",
+    "react-native": "0.85.0",
     "react-native-webview": "^13.16.0"
   },
   "devDependencies": {