fix(deps): update dependency resend to v6

Author: renovate[bot]

bun.lock

@@ -60,7 +60,7 @@
     "react-dom": "^19.1.0",
     "react-hook-form": "^7.53.0",
     "recharts": "^2.15.1",
-    "resend": "^4.5.1",
+    "resend": "^6.0.0",
     "sharp": "^0.34.0",
     "tailwind-merge": "^3.0.0",
     "tailwindcss-animate": "^1.0.7",