Fix CI for Windows

[ludovicm67]

Fixes #173.

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Latest commit: 42d6efa

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[ludovicm67]

@tpluscode I started some work here, but no real success for now.
Feel free to try things here if you want :)

[tpluscode]

You can avoid duplicate steps with conditionals if you set the node version in the job matrix, like

name: Test validation

on: [push, pull_request]

jobs:
  check-constraint:
-   runs-on: ${{ matrix.os }}
+   runs-on: ${{ matrix.env.os }}
    strategy:
      fail-fast: false
      matrix:
-       os:
-         - ubuntu-latest
-         - windows-latest
+       env:
+        - os: ubuntu-latest
+          node: 20
+        - os: windows-latest
+          node: 20.12.1
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
-         node-version: '20'
+         node-version: ${{ matrix.env.node }}

[tpluscode]

Not sure about updating respec but otherwise LGTM