fix(ci) lock down [email protected] to fix test:types

[email protected] removed some of the RuleContext types (see
eslint/eslint#19910), causing the `test:types`
CI script to fail.

As a quick fix to unblock further development, we can lock down the
eslint dependency to 9.30.1, where these types still exist, until a
"proper" solution can be developed.

Fixes #459

Author: mureinik

package.json

@@ -34,7 +34,7 @@
         "@types/node": "^20.17.5",
         "@typescript-eslint/parser": "^8.26.1",
         "@typescript-eslint/typescript-estree": "^8.26.1",
-        "eslint": "^9.14.0",
+        "eslint": "9.30.1",
         "eslint-config-prettier": "^9.1.0",
         "eslint-doc-generator": "^1.7.1",
         "eslint-plugin-eslint-plugin": "^6.3.1",