Github artifacts: Limit Python versions

The build failed trying to create Python 3.6 for Mac.  There was no Python version in the
matrix, so I added it, but I'm not sure if that is what is going on.  I'm not sure what the
default behavior is.

.github/workflows/artifacts_build.yml

@@ -32,9 +32,9 @@ jobs:
     strategy:
       matrix:
         # https://docs.github.com/en/actions/using-jobs/choosing-the-runner-for-a-job
-        # ubuntu-20.04 supports more versions of Python than ubuntu-22.04
         # https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json
-        os: [windows-2019, macos-11, ubuntu-20.04]
+        os: [windows-2019, macos-11, ubuntu-22.04]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
       - uses: actions/checkout@v3