test: Remove support for Node 20

Author: bydawen

.github/workflows/ci.yml

@@ -11,8 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ 20, 24 ]
-    continue-on-error: ${{ matrix.node == 24 }}
+        node: [20, 24]
     steps:
     - name: Checkout
       uses: actions/checkout@v4
@@ -21,7 +20,7 @@ jobs:
     - name: Setup Nodejs
       uses: actions/setup-node@v4
       with:
-        node-version: ${{ matrix.node }}
+        node-version-file: '.nvmrc'
     - name: Install dependencies
       run: npm ci
     - name: Validate package-lock.json changes