📦 Add a stable extra for pip upper bound

It is supposed to correspond to the range of what's tested in our CI.

Co-Authored-By: Jimmy Merrild Krag <beruic@gmail.com>
Co-Authored-By: Stephen Rosen <sirosen@globus.org>

Author: 3 people

pyproject.toml

@@ -55,6 +55,9 @@ repository = "https://github.com/jazzband/pip-tools"
 changelog = "https://github.com/jazzband/pip-tools/releases"
 
 [project.optional-dependencies]
+supported-pip = [
+  "pip <= 25.3",
+]
 testing = [
   "pytest >= 7.2.0",
   "pytest-rerunfailures",

tox.ini

@@ -11,6 +11,8 @@ skip_missing_interpreters = True
 [testenv]
 description = run the tests with pytest
 extras =
+    pipsupported: supported-pip
+    piplowest: supported-pip
     testing
     coverage: coverage
 deps =