regression: push gateway response (#28899)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

apps/meteor/app/push/server/push.js

@@ -120,7 +120,7 @@ class PushClass {
 		}
 
 		const result = await fetch(`${gateway}/push/${service}/send`, { ...data, method: 'POST' });
-		const response = await result.json();
+		const response = await result.text();
 
 		if (result.status === 406) {
 			logger.info('removing push token', token);