chore(deps-dev): bump @reown/appkit-testing in /apps/demo

Bumps [@reown/appkit-testing](https://github.com/reown-com/appkit) from 1.8.8 to 1.8.12.
- [Release notes](https://github.com/reown-com/appkit/releases)
- [Commits](https://github.com/reown-com/appkit/compare/@reown/[email protected]...@reown/[email protected])

---
updated-dependencies:
- dependency-name: "@reown/appkit-testing"
  dependency-version: 1.8.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

apps/demo/package.json

@@ -69,7 +69,7 @@
     "@types/react": "19.1.15",
     "@types/react-dom": "19.1.9",
     "@mailsac/api": "1.0.8",
-    "@reown/appkit-testing": "1.8.8",
+    "@reown/appkit-testing": "1.8.12",
     "@playwright/test": "1.48.2",
     "eslint": "8.56.0",
     "eslint-config-next": "14.1.0",