handle LsxApiOptions request for all axios versions

packages/remark-lsx/src/server/index.ts

@@ -19,7 +19,8 @@ const lsxValidator = [
     .optional()
     .customSanitizer((options) => {
       try {
-        const jsonData: LsxApiOptions = options;
+        const jsonData: LsxApiOptions =
+          typeof options === 'string' ? JSON.parse(options) : options;
 
         for (const key in jsonData) {
           jsonData[key] = filterXSS.process(jsonData[key]);