chore: run workflow with node18 (#74)

Update validation.yml

.github/workflows/validation.yml

@@ -24,7 +24,7 @@ jobs:
     name: 'ESLint'
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [18.x]
     steps:
       - name: Checkout Code
         uses: actions/checkout@v2
@@ -42,7 +42,7 @@ jobs:
     name: 'Stylelint'
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [18.x]
     steps:
       - name: Checkout Code
         uses: actions/checkout@v2