use native fetch everywhere

package.json

@@ -21,12 +21,10 @@
     "eslint": "8.57.0",
     "eslint-config-silverwind": "82.0.3",
     "execa": "8.0.1",
-    "fetch-enhanced": "12.0.1",
     "glowie": "1.2.0",
     "hosted-git-info": "7.0.1",
     "memize": "2.1.0",
     "minimist": "1.2.8",
-    "node-fetch": "3.3.2",
     "p-all": "5.0.0",
     "picomatch": "4.0.1",
     "rc": "1.2.8",

updates.js

@@ -5,7 +5,7 @@ import rat from "registry-auth-token";
 import rc from "rc";
 import {parse, coerce, diff, gt, gte, lt, neq, valid, validRange} from "semver";
 import textTable from "text-table";
-import {cwd, stdout, argv, env, exit, versions} from "node:process";
+import {cwd, stdout, argv, env, exit} from "node:process";
 import hostedGitInfo from "hosted-git-info";
 import {join, dirname, basename, resolve} from "node:path";
 import {lstatSync, readFileSync, truncateSync, writeFileSync, accessSync} from "node:fs";
@@ -17,19 +17,6 @@ import pAll from "p-all";
 import memize from "memize";
 import picomatch from "picomatch";
 
-// bun and deno have built-in proxy support via environment while undici has not,
-// so we fall back to node-fetch with fetch-enhanced wrapper to add it there.
-let fetch;
-if (globalThis.fetch && !versions?.node) {
-  fetch = globalThis.fetch;
-} else {
-  const [{default: nodeFetch}, {default: fetchEnhanced}] = await Promise.all([
-    import("node-fetch"),
-    import("fetch-enhanced"),
-  ]);
-  fetch = fetchEnhanced(nodeFetch, {undici: false});
-}
-
 const MAX_SOCKETS = 96;
 const sep = "\0";