chore(deps): bump ethers from 6.14.0 to 6.15.0 in /apps/demo

Bumps [ethers](https://github.com/ethers-io/ethers.js) from 6.14.0 to 6.15.0.
- [Release notes](https://github.com/ethers-io/ethers.js/releases)
- [Changelog](https://github.com/ethers-io/ethers.js/blob/main/CHANGELOG.md)
- [Commits](ethers-io/ethers.js@v6.14.0...v6.15.0)

---
updated-dependencies:
- dependency-name: ethers
  dependency-version: 6.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

apps/demo/package.json

@@ -52,7 +52,7 @@
     "class-variance-authority": "0.7.1",
     "classnames": "2.5.1",
     "clsx": "2.1.1",
-    "ethers": "6.14.0",
+    "ethers": "6.15.0",
     "next": "14.2.32",
     "next-themes": "0.4.6",
     "react": "19.1.1",