Fix memray on old macOS versions

Author: uglide

.github/workflows/integration.yaml

@@ -45,6 +45,8 @@ jobs:
          run: |
            sudo apt-get install build-essential python3-dev libdebuginfod-dev libunwind-dev liblz4-dev -y -qq
        - name: run tests
+         env:
+           MACOSX_DEPLOYMENT_TARGET: 10.14
          run: |
            pip install -U pip setuptools wheel
            pip install -r dev_requirements.txt