fix test matrix

Author: kyle-west

.github/workflows/test-flow.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [20.x, 22.x, 24.x] # only LTS versions
 
     steps:
     - uses: actions/checkout@v2