Update Streamdown (#1152)

Author: haydenbleasel

package.json

@@ -91,7 +91,7 @@
     "server-only": "^0.0.1",
     "shiki": "^3.12.0",
     "sonner": "^1.5.0",
-    "streamdown": "^1.1.6",
+    "streamdown": "^1.2.0",
     "swr": "^2.2.5",
     "tailwind-merge": "^2.5.2",
     "tailwindcss-animate": "^1.0.7",