feat: update GitHub Actions runtime from node20 to node24

Agent-Logs-Url: https://github.com/EndBug/label-sync/sessions/3d174c13-e65c-4743-9253-05dc5b261c81

Author: Copilot

action.yml

@@ -3,7 +3,7 @@ description: An action that allows you to sync labels from a repository or a con
 author: Federico Grandi <federicograndi@duck.com>
 
 runs:
-  using: node20
+  using: node24
   main: lib/index.js
 
 inputs:

package-lock.json

@@ -32,7 +32,7 @@
   "devDependencies": {
     "@types/github-label-sync": "^2.3.3",
     "@types/js-yaml": "^4.0.9",
-    "@types/node": "~12.20.15",
+    "@types/node": "^24.0.0",
     "@typescript-eslint/eslint-plugin": "^8.56.1",
     "@vercel/ncc": "^0.38.2",
     "gts": "^5.3.1",