Delete upstream workflows

This fork does not ship upstream's releases, and its hosted-runner jobs
never start here.

Claude-Session: https://claude.ai/code/session_01HuMDfgFssPUptYUzgZ6Cp8

.github/workflows/node.yml

@@ -1,42 +0,0 @@
-# This workflow will do a clean install of node dependencies, cache/restore them, build the source code and run tests across different versions of node
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
-
-name: Node.js CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version:
-          - '17'
-          - '16'
-          - '14'
-          - '12'
-          - '10'
-          - '8'
-          - '6'
-          - '4'
-          # - '3' # io.js
-          # - '2' # io.js
-          # - '1' # io.js
-          - '0.12'
-          - '0.10'
-          # - '0.8'
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: npm install
-    - run: npm test