chore(deps): bump better-auth from 1.4.18 to 1.5.4

Bumps [better-auth](https://github.com/better-auth/better-auth/tree/HEAD/packages/better-auth) from 1.4.18 to 1.5.4.
- [Release notes](https://github.com/better-auth/better-auth/releases)
- [Commits](https://github.com/better-auth/better-auth/commits/v1.5.4/packages/better-auth)

---
updated-dependencies:
- dependency-name: better-auth
  dependency-version: 1.5.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

apps/web/package.json

@@ -26,7 +26,7 @@
     "@radix-ui/react-slot": "^1.2.3",
     "@radix-ui/react-tooltip": "^1.2.8",
     "@tanstack/react-query": "^5.90.21",
-    "better-auth": "^1.4.18",
+    "better-auth": "^1.5.4",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "^0.469.0",

packages/auth/package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@objectstack/runtime": "^3.0.9",
     "@objectstack/spec": "3.0.9",
-    "better-auth": "^1.4.18",
+    "better-auth": "^1.5.4",
     "better-sqlite3": "^12.6.2",
     "mongodb": "^7.1.0",
     "pg": "^8.11.3"