[ci] Drop Python 3.9 from CI matrix

Fixes #206

Author: udaydevs

.github/workflows/ci.yml

@@ -27,11 +27,6 @@ jobs:
           - django~=5.1.0
           - django~=5.2.0
         exclude:
-          # Django 5.1+ requires Python >=3.10
-          - python-version: "3.9"
-            django-version: django~=5.1.0
-          - python-version: "3.9"
-            django-version: django~=5.2.0
           # Python 3.13 supported only in Django >=5.1.3
           - python-version: "3.13"
             django-version: django~=4.2.0