OSX has too old bash for CI

Author: rocky

.github/workflows/CI.yml

@@ -8,7 +8,8 @@ jobs:
   tests:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        # os: [ubuntu-latest, macos-latest] # macos has a too-old bash
+        os: [ubuntu-latest]
 
     runs-on: ${{ matrix.os }}
     name: "Run Tests on ${{ matrix.os }}"