feat: upgrade CI scripts' Node.js version to 20 and 22 (#85)

Author: Copilot

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [^16, ^18]
+        node-version: ['20', '22']
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -37,7 +37,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [^16, ^18]
+        node-version: ['20', '22']
     steps:
       - name: Checkout
         uses: actions/checkout@v2