Remove Node 14.x as a test target

Remove Node 14.x as a test target. Vitest needs a higher version.

Author: pryhoda

.github/workflows/run-tests.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x]
+        node-version: [16.x, 18.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps: