refactor: fix incorrect typing for property margins in TableConfig interface

Author: Maito1794

types/index.d.ts

@@ -607,7 +607,12 @@ declare module "jspdf" {
   export interface TableConfig {
     printHeaders?: boolean;
     autoSize?: boolean;
-    margins?: number;
+    margins?: {
+      top: number,
+      bottom: number,
+      left: number,
+      width: number
+    };
     fontSize?: number;
     padding?: number;
     headerBackgroundColor?: string;