chore: drop @types/rc

Author: kazupon

package.json

@@ -93,7 +93,6 @@
     "@types/eslint": "^9.6.1",
     "@types/jsdom": "^21.1.1",
     "@types/node": "^22.10.3",
-    "@types/rc": "^1.2.4",
     "@types/serve-handler": "^6.1.4",
     "@vitest/coverage-v8": "^2.1.5",
     "api-docs-gen": "^0.4.0",