ci: deprecate node 18 and add node 24 (#100)

Author: ryoppippi

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [18.x, 20.x, '22.13.1']
+        node-version: [20.x, 22.x, 24.x]
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}