feat(sort-collections): should sort overrides (#668)

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## PR Checklist

-   [x] Addresses an existing open issue: fixes #619
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/eslint-plugin-package-json/blob/main/.github/CONTRIBUTING.md)
were taken 😊

## Overview

Adds `overrides` to the `defaultCollections`. Note that tests were not
added because `dependencies`/`devDependencies`/`peerDependencies` are
currently not tested.

src/rules/sort-collections.ts

@@ -8,6 +8,7 @@ const defaultCollections = [
 	"devDependencies",
 	"dependencies",
 	"peerDependencies",
+	"overrides",
 	"config",
 	"exports",
 ];