Update CI steps to Node v20

Author: pimterry

.github/workflows/ci.yml

@@ -10,9 +10,9 @@ jobs:
         node-version: [14.x, 16.x, 18.x, 20.x, v20.11.1, '*']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
           check-latest: true