chore(deps-dev): bump @typescript-eslint/rule-tester

Bumps [@typescript-eslint/rule-tester](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/rule-tester) from 8.18.2 to 8.20.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/rule-tester/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v8.20.0/packages/rule-tester)

---
updated-dependencies:
- dependency-name: "@typescript-eslint/rule-tester"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -48,7 +48,7 @@
 		"@types/node": "^22.10.7",
 		"@typescript-eslint/eslint-plugin": "8.19.0",
 		"@typescript-eslint/parser": "8.19.0",
-		"@typescript-eslint/rule-tester": "8.18.2",
+		"@typescript-eslint/rule-tester": "8.20.0",
 		"@vitest/eslint-plugin": "^1.1.25",
 		"bumpp": "^9.10.1",
 		"concurrently": "^9.1.2",