Update Python version from 3.11 to 3.13

- Update .python-version to 3.13
- Update pyproject.toml requires-python to >=3.13,<3.14
- Update Dockerfile base image to python:3.13
- Update Ruff target-version to py313

Author: karbassi

.kiro/specs/python-modernization/tasks.md

@@ -1,6 +1,6 @@
 # Implementation Plan
 
-- [ ] 1. Update Python version configuration files
+- [x] 1. Update Python version configuration files
 
   - Update `.python-version` from `3.11` to `3.13`
   - Update `pyproject.toml` requires-python constraint to `>=3.13,<3.14`

.python-version

@@ -1 +1 @@
-3.11
+3.13

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11.9
+FROM python:3.13
 
 ARG DJANGO_ENV
 

pyproject.toml

@@ -5,7 +5,7 @@ version = "0.0.1"
 license = {text = "MIT"}
 readme = "README.md"
 authors = [{name = "Ali Karbassi", email = "ali@weallcode.org"}]
-requires-python = ">=3.11,<3.12"
+requires-python = ">=3.13,<3.14"
 
 dependencies = [
     # Core Framework
@@ -78,7 +78,7 @@ Homepage = "https://github.com/weallcode/website"
 
 [tool.ruff]
 # Use Ruff's recommended defaults
-target-version = "py311"
+target-version = "py313"
 # Exclude a variety of commonly ignored directories.
 extend-exclude = [
     "*/migrations/*.py",