test: Actually update the matrix for the CI build too

Author: KallynGowdy

.github/workflows/continuous-integration-workflow.yml

@@ -37,8 +37,8 @@ jobs:
         name: Build
         strategy:
             matrix:
-                os: [ubuntu-latest, macOS-latest, windows-latest]
-                node-version: [12.x]
+                os: [ubuntu-latest, macos-12, windows-latest]
+                node-version: [12.x, 20.x]
         runs-on: ${{ matrix.os }}
         steps:
             - uses: actions/checkout@v1