Drop python 3.8, add 3.13

Author: richin13

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = pre-commit,py{38,39,310,311,312}-sql{12,13,14,20}
+envlist = pre-commit,py{39,310,311,312,313}-sql{12,13,14,20}
 skipsdist = true
 minversion = 3.7.0