Run tests on node 18 only

Author: adrianprelipcean

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 18.x]
+        node-version: [18.x]
 
     steps:
       - uses: actions/checkout@v3