Revert "python3Packages.pip: 25.0.1 -> 25.3"

This reverts commit 3f493a2b8dda0c9b564f96b5f7c4dc22c93c6d71.

pkgs/development/python-modules/pip/default.nix

@@ -6,7 +6,8 @@
 
   # build-system
   installShellFiles,
-  flit-core,
+  wheel,
+  setuptools,
 
   # docs
   sphinx,
@@ -31,14 +32,14 @@
 let
   self = buildPythonPackage rec {
     pname = "pip";
-    version = "25.3";
-    pyproject = true;
+    version = "25.0.1";
+    format = "pyproject";
 
     src = fetchFromGitHub {
       owner = "pypa";
       repo = "pip";
       tag = version;
-      hash = "sha256-aHV4j9OMLD6I6Fe6A04bE7xk6eS5CxeUEw4Psqj7xz0=";
+      hash = "sha256-V069rAL6U5KBnSc09LRCu0M7qQCH5NbMghVttlmIoRY=";
     };
 
     postPatch = ''
@@ -49,6 +50,8 @@ let
 
     nativeBuildInputs = [
       installShellFiles
+      setuptools
+      wheel
     ]
     ++ lib.optionals (pythonAtLeast "3.11") [
       # docs
@@ -57,8 +60,6 @@ let
       sphinx-issues
     ];
 
-    build-system = [ flit-core ];
-
     outputs = [
       "out"
     ]