GitHub Actions: Add Node v23 to the testing

Assure that the following were handled:
* brianc#3332
* brianc#3337

Author: cclauss

.github/workflows/ci.yml

@@ -42,6 +42,7 @@ jobs:
           - '18'
           - '20'
           - '22'
+          - '23'
         os:
           - ubuntu-latest
     name: Node.js ${{ matrix.node }}