try to use brew version of python

Author: umbynos

.github/workflows/release.yml

@@ -62,20 +62,25 @@ jobs:
         run: git apply -v "${{ env.IMGTOOL_PACKING_PATH }}/patches/"*
 
       - name: Set up Python ${{ env.PYTHON_VERSION }}
+        if: matrix.os != 'macos-10.15'
         uses: actions/setup-python@v3
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           architecture: ${{ matrix.python_arch }}
+        
+      - name: Set up Python ${{ env.PYTHON_VERSION }} on macOS 
+        if: matrix.os == 'macos-10.15'
+        run: brew install python@${{ env.PYTHON_VERSION }}
 
       - name: Upgrade PIP
-        run: python -m pip install --upgrade pip setuptools wheel
+        run: python3 -m pip install --upgrade pip setuptools wheel
 
       - name: Install python dependencies
         working-directory: ${{ env.MCUBOOT_PATH }}/scripts/
-        run: pip install -r requirements.txt
+        run: pip3 install -r requirements.txt
 
       - name: Install pyinstaller
-        run: pip install pyinstaller==5.0.1
+        run: pip3 install pyinstaller==5.0.1
 
       - name: Build
         if: matrix.os != 'macos-10.15'