Drop Python 3.9 support (#434)

Removed Python version 3.9 from CI workflow matrix.
Removed Python 3.9 from the environment list.

Co-authored-by: Łukasz Langa <[email protected]>

Author: ezio-melotti

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
       - uses: actions/checkout@v6

readme.rst

@@ -53,7 +53,7 @@ Deploy
 Requirements and dependencies
 =============================
 
-- Python 3.9+
+- Python 3.10+
 - aiohttp
 - aiohttp-jinja2
 - gidgethub >= 5.0.0

tox.ini

@@ -2,7 +2,7 @@
 requires =
     tox>=4.2
 env_list =
-    py{314, 313, 312, 311, 310, 39}
+    py{314, 313, 312, 311, 310}
 
 [testenv]
 deps =