Add Node 21 to CI

Author: drwpow

.github/workflows/ci.yml

@@ -35,11 +35,12 @@ jobs:
           version: latest
       - run: pnpm i
       - run: pnpm run lint
-  test-node-versions:
-    runs-on: ubuntu-latest
+  test:
     strategy:
       matrix:
-        node-version: [18.x, 20.x]
+        node-version: [18.x, 20.x, 21.x]
+        os: [ubuntu-latest, windows-latest, mac-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
@@ -50,31 +51,3 @@ jobs:
           version: latest
       - run: pnpm i
       - run: pnpm test
-  test-macos:
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
-        with:
-          node-version: 20
-      - uses: pnpm/action-setup@v2
-        with:
-          version: latest
-      - run: pnpm i
-      - run: pnpm test
-        env:
-          CI_ENV: macos
-  test-windows:
-    runs-on: windows-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
-        with:
-          node-version: 20
-      - uses: pnpm/action-setup@v2
-        with:
-          version: latest
-      - run: pnpm i
-      - run: pnpm test
-        env:
-          CI_ENV: windows