Drop Python 3.9 support and adapt SPEC 0 standard (#254)

Author: No767

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [3.9, '3.10', '3.11', '3.12', '3.13']
+        version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
       - name: Checkout Repository  

docs/dev-guide/introduction.rst

@@ -185,3 +185,9 @@ Type Hinting
 Rodhaj actively uses `type hinting <https://docs.python.org/3/library/typing.html>`_ in order to verify for types before runtime.
 `Pyright <https://github.com/microsoft/pyright>`_ is used to enforce this standard. Checks happen before you commit, and on Github actions.
 These checks are activated by default on VSCode. Pyright is available as a LSP on Neovim.
+
+Minimum supported Python versions
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Rodhaj implements the `SPEC 0 <https://scientific-python.org/specs/spec-0000/>`_ standard. 
+Spefically, Python versions over **3 years** are dropped after initial release.

pyproject.toml

@@ -3,7 +3,7 @@ name = "rodhaj"
 version = "0.3.1"
 description = "A improved, modern version of ModMail for Transprogrammer"
 license = {file = "LICENSE"}
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 
 [tool.pyright]
 include = ["bot/**"]

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 requires =
     tox>=4
-env_list = py{39,310,311,312,313}
+env_list = py{310,311,312,313}
 no_package = true
 
 [testenv]