Bump lowest tested pip to v23.1

Author: webknjaz

pyproject.toml

@@ -38,7 +38,8 @@ dependencies = [
   # direct dependencies
   "build >= 1.0.0",
   "click >= 8",
-  "pip >= 22.2",
+  "pip >= 23.1; python_version >= '3.12'",
+  "pip >= 22.2; python_version < '3.12'",
   "pyproject_hooks",
   "tomli; python_version < '3.11'",
   # indirect dependencies

tox.ini

@@ -15,7 +15,8 @@ extras =
     coverage: coverage
 deps =
     pipsupported: pip==24.2
-    piplowest: pip==22.2.*
+    piplowest: pip==23.1.*; python_version >= "3.12"
+    piplowest: pip==22.2.*; python_version < "3.12"
     piplatest: pip
     pipmain: https://github.com/pypa/pip/archive/main.zip
 setenv =