fix: update some examples

extra/push-examples/javascript-fetch/index.js

@@ -1,9 +1,10 @@
 // Supports: Node.js >= 18, Deno, Bun
 const pushURL = "https://example.com/api/push/key?status=up&msg=OK&ping=";
 const interval = 60;
+const method = "GET";
 
 const push = async () => {
-    await fetch(pushURL);
+    await fetch(pushURL, { method });
     console.log("Pushed!");
 };