fix: missing & in registery query (#278)

<!-- 👋 Hi, thanks for sending a PR to npm-username-to-packages! 💖.
Please fill out all fields below and make sure each item is true and [x]
checked.
Otherwise we may not be able to review your PR. -->

## PR Checklist

- [x] Addresses an existing open issue: fixes #277
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/npm-username-to-packages/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/npm-username-to-packages/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

The queried URL was passing a weird string for `from`.

💖

src/npmUsernameToPackages.ts

@@ -28,7 +28,7 @@ export async function npmUsernameToPackages(maintainer: string) {
 
 	while (true) {
 		const response = await fetch(
-			`https://registry.npmjs.com/-/v1/search?from=${packages.length}size=250&text=maintainer:${maintainer}`,
+			`https://registry.npmjs.com/-/v1/search?from=${packages.length}&size=250&text=maintainer:${maintainer}`,
 			{
 				headers: { "Content-Type": "application/json" },
 			},