Bump @typescript-eslint/rule-tester from 7.16.0 to 8.20.0

Bumps [@typescript-eslint/rule-tester](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/rule-tester) from 7.16.0 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-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "jest": "^29.7.0",
     "markdownlint-cli2": "^0.17.1",
     "markdownlint-cli2-formatter-pretty": "^0.0.7",
-    "@typescript-eslint/rule-tester": "7.16.0",
+    "@typescript-eslint/rule-tester": "8.20.0",
     "@types/jest": "^29.5.13"
   },
   "prettier": "@github/prettier-config"