[deps] Dropped support for Python 3.9

Co-authored-by: Gagan Deep <pandafy.dev@gmail.com>

Author: Srinath0916

.github/workflows/ci.yml

@@ -21,7 +21,6 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
@@ -31,11 +30,6 @@ 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

Dockerfile

@@ -1,6 +1,6 @@
 # NOTE: This Docker image is for development purposes only.
 
-FROM python:3.9-slim-buster
+FROM python:3.12-slim-bookworm
 
 RUN apt update && \
     apt install --yes zlib1g-dev libjpeg-dev gdal-bin libproj-dev \

docs/developer/installation.rst

@@ -10,7 +10,7 @@ Developer Installation Instructions
 Dependencies
 ------------
 
-- Python >= 3.9
+- Python >= 3.10
 - OpenSSL
 
 Installing for Development