Update GitHub Actions

Author: mdmintz

.github/workflows/python-nightly-mac.yml

@@ -14,9 +14,9 @@ jobs:
     runs-on: macos-latest
     strategy:
       fail-fast: false
-      max-parallel: 6
+      max-parallel: 5
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v4