test: Remove support for Node 20

Author: bydawen

.github/workflows/ci.yml

@@ -9,9 +9,6 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        node: [20, 24]
     steps:
     - name: Checkout
       uses: actions/checkout@v4