MAINT: PR 144 revisions

* looks like we'll need to use `MB_PYTHON_OSX_VER: 10.9`
for Python 3.8 and 3.9 MacOS arm64 thin wheel builds because
that is the only way to get the Python download URLs to work

Author: tylerjereddy

azure-pipelines.yml

@@ -57,7 +57,7 @@ jobs:
           PLAT: universal2
         osx-Py38_arm64:
           MB_PYTHON_VERSION: "3.8"
-          MB_PYTHON_OSX_VER: "11.0"
+          MB_PYTHON_OSX_VER: "10.9"
           PLAT: arm64
         osx-Py39:
           MB_PYTHON_VERSION: "3.9"
@@ -68,7 +68,7 @@ jobs:
           PLAT: universal2
         osx-Py39_arm64:
           MB_PYTHON_VERSION: "3.9"
-          MB_PYTHON_OSX_VER: "11.0"
+          MB_PYTHON_OSX_VER: "10.9"
           PLAT: arm64
         osx-Py310:
           MB_PYTHON_VERSION: "3.10"