keep only python 3.13 for ci

Author: mciepluc

.github/workflows/main.yml

@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.11', '3.12', '3.13']
+        python-version: ['3.13']
 
     steps:
     - uses: actions/checkout@v2

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py311, py312, py313
+envlist = py313
 
 [testenv]
 passenv =
@@ -20,6 +20,4 @@ commands =
 
 [gh-actions]
 python =
-    3.11: py311
-    3.12: py312
     3.13: py313