Deprecate python 3.6 support

Author: Alex-Welsh

.github/workflows/tox.yml

@@ -9,22 +9,7 @@ jobs:
         fail-fast: false
         matrix:
           environment: [pep8,py3]
-          python-minor-version: [6,8,10,12]
-          is-not-python36:
-            - ${{
-                  (github.base_ref == 'stackhpc/zed') ||
-                  (github.ref == 'refs/heads/stackhpc/zed') ||
-                  (github.base_ref == 'stackhpc/2023.1') ||
-                  (github.ref == 'refs/heads/stackhpc/2023.1') ||
-                  (github.base_ref == 'stackhpc/2023.2') ||
-                  (github.ref == 'refs/heads/stackhpc/2023.2') ||
-                  (github.base_ref == 'stackhpc/2024.1') ||
-                  (github.ref == 'refs/heads/stackhpc/2024.1') ||
-                  (github.base_ref == 'stackhpc/2025.1') ||
-                  (github.ref == 'refs/heads/stackhpc/2025.1') ||
-                  (github.base_ref == 'stackhpc/master') ||
-                  (github.ref == 'refs/heads/stackhpc/master')
-                }}
+          python-minor-version: [8,10,12]
           is-not-python38:
             - ${{
                   ((github.repository == 'stackhpc/kayobe') &&
@@ -43,10 +28,6 @@ jobs:
                   (github.ref == 'refs/heads/stackhpc/master')
                 }}
           exclude:
-            - environment: pep8
-              python-minor-version: 6
-            - is-not-python36: true
-              python-minor-version: 6
             - is-not-python36: true
               environment: pep8
               python-minor-version: 8