Add macos-latest to workflow actions

This is a test commit to verify whether existing workflow actions can
run on macos-latest.

See opensearch-project/opensearch-build#38
for more details.

Signed-off-by: Michael Froh <froh@amazon.com>

.github/workflows/dashboards-notifications-test-and-build-workflow.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         # TODO: macos-latest was removed due to CI flakiness, we can revisit adding it back later
-        os: [ ubuntu-latest, windows-latest ]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         include:
           - os: windows-latest
             working_directory: X:\