Upgrade pip from 24.1.2 -> 24.3.1

Author: zanieb

pythonbuild/downloads.py

@@ -262,10 +262,10 @@
         "version": "0.13.1",
     },
     "pip": {
-        "url": "https://files.pythonhosted.org/packages/e7/54/0c1c068542cee73d8863336e974fc881e608d0170f3af15d0c0f28644531/pip-24.1.2-py3-none-any.whl",
-        "size": 1824406,
-        "sha256": "7cd207eed4c60b0f411b444cd1464198fe186671c323b6cd6d433ed80fc9d247",
-        "version": "24.1.2",
+        "url": "https://files.pythonhosted.org/packages/ef/7d/500c9ad20238fcfcb4cb9243eede163594d7020ce87bd9610c9e02771876/pip-24.3.1-py3-none-any.whl",
+        "size": 1822182,
+        "sha256": "3790624780082365f47549d032f3770eeb2b1e8bd1f7b2e02dace1afa361b4ed",
+        "version": "24.3.1",
     },
     "readline": {
         "url": "https://ftp.gnu.org/gnu/readline/readline-8.2.tar.gz",