chore(deps): bump better-auth from 1.4.6 to 1.4.9

Bumps [better-auth](https://github.com/better-auth/better-auth/tree/HEAD/packages/better-auth) from 1.4.6 to 1.4.9.
- [Release notes](https://github.com/better-auth/better-auth/releases)
- [Commits](https://github.com/better-auth/better-auth/commits/v1.4.9/packages/better-auth)

---
updated-dependencies:
- dependency-name: better-auth
  dependency-version: 1.4.9
  dependency-type: direct:production
...

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

Author: dependabot[bot]

apps/cms/package.json

@@ -37,7 +37,7 @@
     "@vvo/tzdb": "^6.176.0",
     "ai": "^5.0.108",
     "axios": "^1.13.5",
-    "better-auth": "1.4.6",
+    "better-auth": "1.4.9",
     "canvas-confetti": "^1.9.3",
     "class-variance-authority": "^0.7.0",
     "croner": "^9.1.0",