Update build.yml

Author: codeofandrin

.github/workflows/build.yml

@@ -14,10 +14,15 @@ jobs:
       - name: Check out Git repository
         uses: actions/checkout@v1
 
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: 3.9
+
+      - name: Build Python from source
+        run: |
+          curl -O https://www.python.org/ftp/python/3.9.21/Python-3.9.21.tgz
+          tar xzf Python-3.9.21.tgz
+          cd Python-3.9.21
+          ./configure MACOSX_DEPLOYMENT_TARGET=10.9
+          make
+          make install
 
       - name: Install backend dependencies
         id: install-backend-deps