revert: remove node.js version 20 support

Author: ixartz

.github/workflows/CI.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [16.x, 18.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     name: Build with ${{ matrix.node-version }}