Disable mac build test - not sure why it fails

Author: jloveric

.github/workflows/python-app.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         python-version: [3.9]
         poetry-version: [1.8.3]
-        os: [ubuntu-latest, macos-latest] #[ubuntu-latest,macos-latest, windows-latest] windows and mac are flaky
+        os: [ubuntu-latest] #[ubuntu-latest,macos-latest, windows-latest] windows and mac are flaky
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2