[New curl version] 8.1.0

[github-actions]

https://github.com/curl/curl/releases/tag/curl-8_1_0

[dscho]

When it rains, it pours. Of course this had to come in while I'm in the middle of finalizing #4426... sigh

Let's hold off deploying this until I have successfully released Git for Windows v2.41.0-rc0. In the meantime, I'll trigger the automation to open the PR.

[dscho]

/open pr

The MSYS workflow run was started

The MINGW workflow run was started

[dscho]

/add release note

The workflow run was started