Fix: Streamdown memo comparison function doesn't check for changes to the allowedTags prop, causing the component to skip re-renders when allowedTags changes

Co-authored-by: haydenbleasel <hello@haydenbleasel.com>

Author: vercel[bot]

packages/streamdown/index.tsx

@@ -445,6 +445,7 @@ export const Streamdown = memo(
     prevProps.mode === nextProps.mode &&
     prevProps.plugins === nextProps.plugins &&
     prevProps.className === nextProps.className &&
-    prevProps.linkSafety === nextProps.linkSafety
+    prevProps.linkSafety === nextProps.linkSafety &&
+    prevProps.allowedTags === nextProps.allowedTags
 );
 Streamdown.displayName = "Streamdown";