fix: respect no proxy directive (#1037)

Closes #1034

src/utils/fetch.ts

@@ -1,18 +1,8 @@
-import { ProxyAgent, type RequestInit, fetch as undiciFetch } from "undici";
-
-export function getProxyAgent() {
-  const httpProxy = process.env.HTTP_PROXY || process.env.http_proxy;
-  if (httpProxy) {
-    return new ProxyAgent(httpProxy);
-  }
-
-  const httpsProxy = process.env.HTTPS_PROXY || process.env.https_proxy;
-  if (httpsProxy) {
-    return new ProxyAgent(httpsProxy);
-  }
-
-  return undefined;
-}
+import {
+  EnvHttpProxyAgent,
+  type RequestInit,
+  fetch as undiciFetch,
+} from "undici";
 
 export const fetch = async (url: string, opts: RequestInit) => {
   // Merge timeout signal with any existing signal from opts
@@ -23,7 +13,7 @@ export const fetch = async (url: string, opts: RequestInit) => {
     : timeoutSignal;
 
   return await undiciFetch(url, {
-    dispatcher: getProxyAgent(),
+    dispatcher: new EnvHttpProxyAgent(),
     ...opts,
     signal: mergedSignal,
   });