ci: Simplify build matrix

Removes windows and macos from build matrix and adds node 17

Author: danielwaltz

.github/workflows/main.yml

@@ -6,8 +6,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node: ['12.x', '14.x', '16.x']
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        node: ['14.x', '16.x', '17.x']
+        os: [ubuntu-latest]
 
     steps:
       - name: Checkout repo