chore: add Resend in sponsor list (#13082)

Author: ThangHuuVu

docs/pages/sponsors.mdx

@@ -150,6 +150,11 @@ It would not be possible without the generous support of our sponsors.
       "https://avatars.githubusercontent.com/u/153308555?v=4",
       "Sent.dm",
     ],
+    [
+      "https://go.resend.com/authjs",
+      "https://avatars.githubusercontent.com/u/109384852?s=200&v=4",
+      "Resend",
+    ],
   ].map(([href, src, name]) => (
     <a
       key={name}