Remove node 12 test

Author: birkskyum

.circleci/config.yml

@@ -10,22 +10,6 @@ orbs:
 # https://hub.docker.com/r/cimg/node/tags/
 
 jobs:
-  install-and-cibuild-node12: # cibuild using node 12 & npm 6
-    docker:
-      - image: cimg/node:12.22.7
-    working_directory: ~/plotly.js
-    steps:
-      - checkout
-      - run:
-          name: Set up build environment
-          command: .circleci/env_build.sh
-      - run:
-          name: Pretest
-          command: npm run pretest
-      - run:
-          name: CI-Build
-          command: npm run cibuild
-
   install-and-cibuild:
     docker:
       - image: cimg/node:18.20.4