Update action runtime to node 24

https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: actions/setup-node@v5
         with:
-          node-version: 20.x
+          node-version: 24.x
           cache: npm
       - run: npm ci
       - run: npm run build

action.yml

@@ -94,7 +94,7 @@ outputs:
   pull-request-branch:
     description: 'The pull request branch name'
 runs:
-  using: 'node20'
+  using: 'node24'
   main: 'dist/index.js'
 branding:
   icon: 'git-pull-request'