ci(github-actions): drop node 12.x (#821)

Author: chimurai

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 18.x]
+        node-version: [14.x, 16.x, 18.x]
 
     steps:
       - uses: actions/checkout@v3