style: add missing brackets in template

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/Pushover.ts

@@ -500,8 +500,7 @@ export class Pushover {
           if (verbose) {
             console.log("Received response status:", res.statusCode);
             console.log("Received response headers:", res.headers);
-            console.log(
-              `Received response body (length: ${data.length}: ${data}`,
+              `Received response body (length: ${data.length}): ${data}`,
             );
           }
           try {