ci: upgrade Node.js from v18 to v20

Author: ahonn

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
           registry-url: 'https://registry.npmjs.org'
 
       - name: Setup pnpm

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4

package.json

@@ -48,7 +48,7 @@
     "typescript": "^5.7.3"
   },
   "engines": {
-    "node": ">=18.0.0"
+    "node": ">=20.8.1"
   },
   "packageManager": "pnpm@10.12.1+sha512.f0dda8580f0ee9481c5c79a1d927b9164f2c478e90992ad268bbb2465a736984391d6333d2c327913578b2804af33474ca554ba29c04a8b13060a717675ae3ac"
 }