update workflow

Author: nghia-vo

.github/workflows/discorpy_ga.yml

@@ -35,9 +35,9 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: Upgrade pip on macOS only
-      if: runner.os == 'macOS'
-      run: python -m pip install --upgrade pip
+    - name: Install build essentials on macOS with Python 3.8 only
+      if: runner.os == 'macOS' && matrix.python-version == '3.8'
+      run: python -m pip install setuptools==51.0.0 wheel
 
     - name: Install dependencies
       run: |