build+ci: support macOS on arm64

Refs: #5135
Change-Id: Ifac57bf18dea805dc9eab06039806858bb3b6f20
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 47d9a6a..2854627 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -53,7 +53,7 @@
             os: macos-11
     runs-on: ${{ matrix.os }}
     env:
-      NODE_LABELS: OSX
+      NODE_LABELS: macos
       WAF_JOBS: 3
     steps:
       - name: Set up Xcode