ci: update deprecated ubuntu image

See: actions/runner-images#11101

Author: nan-li

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
       - name: '[Setup] Node'