ci(config): Update GitHub workflow's node and ubuntu version

Author: ynishimura

.github/workflows/config.yml

@@ -4,12 +4,12 @@ on: [push, pull_request]
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2.1.4
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 14
+          node-version: 18
       - run: |
           npm install
       - run: |