Remove dependendabot pip config

Dependabot has a failed workflow due to it having an unsupported python version (3.8). I'm not sure why we have pip updates enabled for dependabot at all for this repo, given we explicitly don't update python dependencies for python-docker (there are none in the repo outside of the ones for the v1/v2 images).

Consider removing it (we might need to explicitly disable and ignore the requirements.txt paths due to dependabot's tendency to pick up any .txt file as a pip requirements file even if you haven't configured it)

首先检查仓库的 Dependabot 配置以及链接的失败 workflow。检查 requirements.txt 路径是如何被发现或配置的；当移除 pip 更新或明确禁用它们，并且不再出现不支持 Python 3.8 的 workflow 问题时，即表示完成。