ERROR: Could not upgrade pip because of HTTP error 403 Client error

[aihua]

Reproduce Step:

python3 -m venv .venv
source .venv/bin/activate
pip config set global.index-url https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple
pip install --upgrade pip

Relevant log output:

Looking in indexes: https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple
Requirement already satisfied: pip in ./.venv/lib/python3.13/site-packages (24.3.1)
Collecting pip
  ERROR: HTTP error 403 while getting https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/c9/bc/b7db44f5f39f9d0494071bddae6880eb645970366d0a200022a1a93d57f5/pip-25.0.1-py3-none-any.whl (from https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/pip/) (requires-python:>=3.8)

[notice] A new release of pip is available: 24.3.1 -> 25.0.1
[notice] To update, run: pip install --upgrade pip
ERROR: Could not install requirement pip from https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/c9/bc/b7db44f5f39f9d0494071bddae6880eb645970366d0a200022a1a93d57f5/pip-25.0.1-py3-none-any.whl because of HTTP error 403 Client Error: Forbidden for url: https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/c9/bc/b7db44f5f39f9d0494071bddae6880eb645970366d0a200022a1a93d57f5/pip-25.0.1-py3-none-any.whl for URL https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/c9/bc/b7db44f5f39f9d0494071bddae6880eb645970366d0a200022a1a93d57f5/pip-25.0.1-py3-none-any.whl (from https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/pip/) (requires-python:>=3.8)

Python Version:
Python 3.13.1

OS:
macOS Version 15.3.1 (24D70)