chore(deps): update dependency eslint-plugin-package-json to ^0.21.0 (#751)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[eslint-plugin-package-json](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json)
| [`^0.20.0` ->
`^0.21.0`](https://renovatebot.com/diffs/npm/eslint-plugin-package-json/0.20.1/0.21.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/eslint-plugin-package-json/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/eslint-plugin-package-json/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/eslint-plugin-package-json/0.20.1/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/eslint-plugin-package-json/0.20.1/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>JoshuaKGoldberg/eslint-plugin-package-json
(eslint-plugin-package-json)</summary>

###
[`v0.21.1`](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/blob/HEAD/CHANGELOG.md#0211-2025-01-24)

[Compare
Source](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/compare/v0.21.0...v0.21.1)

##### Bug Fixes

- **no-redundant-files:** detect variations of README.md as redundant
([#&#8203;765](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/765))
([7453095](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/commit/745309536c3d2c175591582147028754f9287b1d)),
closes
[#&#8203;763](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/763)
[#&#8203;763](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/763)

###
[`v0.21.0`](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/blob/HEAD/CHANGELOG.md#0210-2025-01-23)

[Compare
Source](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/compare/v0.20.1...v0.21.0)

##### Features

- add no-empty-fields rule
([#&#8203;741](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/741))
([e57765b](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/commit/e57765b3de7c4703f1c697d54758e5789494281a)),
closes
[#&#8203;683](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/683)

####
[0.20.1](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/compare/v0.20.0...v0.20.1)
(2025-01-19)

##### Bug Fixes

- bump package-json-validator dep to 0.8
([#&#8203;735](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/735))
([29a9722](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/commit/29a9722c15d39984ea99c2be346e20c2f4f9c76e)),
closes
[#&#8203;734](https://redirect.github.com/JoshuaKGoldberg/eslint-plugin-package-json/issues/734)

</details>

---

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---

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---

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package.json

@@ -101,7 +101,7 @@
 		"eslint-plugin-jsonc": "^2.18.2",
 		"eslint-plugin-markdown": "^5.1.0",
 		"eslint-plugin-n": "^17.14.0",
-		"eslint-plugin-package-json": "^0.20.0",
+		"eslint-plugin-package-json": "^0.21.0",
 		"eslint-plugin-perfectionist": "^4.1.2",
 		"eslint-plugin-regexp": "^2.7.0",
 		"eslint-plugin-yml": "^1.15.0",