Fix upb macos job names

PiperOrigin-RevId: 559624444
diff --git a/.github/workflows/test_upb.yml b/.github/workflows/test_upb.yml
index f3b1926..80afb04 100644
--- a/.github/workflows/test_upb.yml
+++ b/.github/workflows/test_upb.yml
@@ -84,7 +84,7 @@
         config:
           - { name: "macOS", bazel-command: "test" }
           - { name: "macOS ARM (build only)", bazel-command: "build", flags: "--cpu=darwin_arm64" }
-    name: macOS
+    name: ${{ matrix.config.name }}
     runs-on: macos-12
     steps:
       - name: Checkout pending changes