build(deps): bump better-auth from 1.5.2 to 1.6.2

Bumps [better-auth](https://github.com/better-auth/better-auth/tree/HEAD/packages/better-auth) from 1.5.2 to 1.6.2.
- [Release notes](https://github.com/better-auth/better-auth/releases)
- [Changelog](https://github.com/better-auth/better-auth/blob/main/packages/better-auth/CHANGELOG.md)
- [Commits](https://github.com/better-auth/better-auth/commits/better-auth@1.6.2/packages/better-auth)

---
updated-dependencies:
- dependency-name: better-auth
  dependency-version: 1.6.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -85,7 +85,7 @@
     "@tanstack/react-start": "1.166.1",
     "@tanstack/zod-adapter": "1.163.3",
     "@uidotdev/usehooks": "2.4.1",
-    "better-auth": "1.5.2",
+    "better-auth": "1.6.2",
     "boring-avatars": "2.0.4",
     "class-variance-authority": "0.7.1",
     "clsx": "2.1.1",