ci: remove node 4

Author: goto-bus-stop

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [4.x, 6.x, 8.x, 10.x, 12.x, 14.x, 16.x, 18.x]
+        node-version: [6.x, 8.x, 10.x, 12.x, 14.x, 16.x, 18.x]
 
     steps:
     - uses: actions/checkout@v3