chore(deps): update dependency @rslib/core to v0.20.0 (#426)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/rslint-api/package.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "@typescript/api": "workspace:*",
     "@typescript/ast": "workspace:*",
-    "@rslib/core": "0.18.0",
+    "@rslib/core": "0.20.0",
     "@types/node": "24.3.0",
     "@typescript/native-preview": "7.0.0-dev.20250904.1"
   },