auth: bump better auth beta

package.json

@@ -46,7 +46,7 @@
     "@astrojs/mdx": "4.3.7",
     "@astrojs/node": "9.5.0",
     "@astrojs/react": "^4.4.0",
-    "@better-auth/sso": "^1.3.28",
+    "@better-auth/sso": "1.4.0-beta.12",
     "@octokit/plugin-throttling": "^11.0.2",
     "@octokit/rest": "^22.0.0",
     "@radix-ui/react-accordion": "^1.2.12",
@@ -74,7 +74,7 @@
     "@types/react-dom": "^19.2.2",
     "astro": "^5.14.8",
     "bcryptjs": "^3.0.2",
-    "better-auth": "^1.3.28",
+    "better-auth": "1.4.0-beta.12",
     "canvas-confetti": "^1.9.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",