refactor: use string values for node versions in CI config

Co-authored-by: hsluoyz <3787410+hsluoyz@users.noreply.github.com>

Author: Copilot

.github/workflows/main.yml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20, 22]
+        node-version: ['20', '22']
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -33,7 +33,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20, 22]
+        node-version: ['20', '22']
     steps:
       - name: Checkout
         uses: actions/checkout@v2