Update dependency eslint to v9.21.0 (#1232)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [eslint](https://eslint.org)
([source](https://redirect.github.com/eslint/eslint)) | [`9.20.1` ->
`9.21.0`](https://renovatebot.com/diffs/npm/eslint/9.20.1/9.21.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/eslint/9.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/eslint/9.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/eslint/9.20.1/9.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/eslint/9.20.1/9.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>eslint/eslint (eslint)</summary>

###
[`v9.21.0`](https://redirect.github.com/eslint/eslint/compare/v9.20.1...ecd0ede7fd2ccbb4c0daf0e4732e97ea0f49db1b)

[Compare
Source](https://redirect.github.com/eslint/eslint/compare/v9.20.1...ecd0ede7fd2ccbb4c0daf0e4732e97ea0f49db1b)

</details>

---

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rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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package-lock.json

@@ -12,7 +12,7 @@
     "changelog-updater": "2.0.3",
     "concurrently": "9.1.2",
     "cpy-cli": "5.0.0",
-    "eslint": "9.20.1",
+    "eslint": "9.21.0",
     "eslint-config-prettier": "10.0.1",
     "eslint-plugin-import": "2.31.0",
     "eslint-plugin-prettier": "5.2.3",