fix matrix in ci workflow

Author: silkentrance

.github/workflows/node.js.yml

@@ -12,13 +12,14 @@ on:
 jobs:
   build:
 
-    runs-on: [ubuntu-latest, windows-latest]
-
     strategy:
       matrix:
         node-version: [12.x, 14.x, 16.x, 18.x]
+        os: [ubuntu-latest, windows-latest]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
+    runs-on: ${{ matrix.os }}
+
     steps:
     - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}