Fix typecheck

Author: jmurzy

src/use/koa.ts

@@ -122,7 +122,7 @@ export function createHandler<Context extends OperationContext = undefined>(
         body: () => {
           if (ctx.request.body) {
             // in case koa has a body parser
-            return ctx.request.body as any;
+            return ctx.request.body as Record<string, unknown>;
           }
           return new Promise<string>((resolve) => {
             let body = '';