chore(deps-dev): bump better-auth from 1.4.17 to 1.5.6

Bumps [better-auth](https://github.com/better-auth/better-auth/tree/HEAD/packages/better-auth) from 1.4.17 to 1.5.6.
- [Release notes](https://github.com/better-auth/better-auth/releases)
- [Commits](https://github.com/better-auth/better-auth/commits/v1.5.6/packages/better-auth)

---
updated-dependencies:
- dependency-name: better-auth
  dependency-version: 1.5.6
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -27,7 +27,7 @@
   "devDependencies": {
     "@types/node": "^20.0.0",
     "@types/react": "^18.0.0",
-    "better-auth": "^1.4.17",
+    "better-auth": "^1.5.6",
     "react": "^19.2.3",
     "typescript": "^5.0.0"
   },