Remove Python-3.6 from MacOS.

No longer available on Github.

Author: termim

.github/workflows/test_macos.yml

@@ -31,7 +31,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-            python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+            python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
             os: [macos-latest]
 
     steps: