Update instructions for Windows GCM

[mavaddat]

• [x] I provide my work under the project license.
• [x] I grant such license of my work as is required for the purposes of future print editions to Ben Straub and Scott Chacon.

Changes

Microsoft/Git-Credential-Manager-for-Windows was archived on 2020 Sep 30 and it is no longer being maintained.

The cross-platform Git Credential Manager Core (GCM Core) is the official replacement.

Therefore, I have updated the documentation to reflect this fact and recommend instead that readers rely on Git Credential Manager Core (GCM Core).

Context

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[HonkingGoose]

There's a GitHub Blog about the Git Credential Manager that explains all the changes. 😉

We may need to check the whole credentials.asc file, and update it? But that should be tracked in its own issue probably. 😄

[mavaddat]

There's a GitHub Blog about the Git Credential Manager that explains all the changes.

Yes! That blog post is a nice historiographic explanation of the GCM module. It contains much more than the specific technical details needed to get using GCM. I distilled the info from my own findings using trial-and-error to successfully implement GCM in both Linux (WSL2) and Windows.

We may need to check the whole credentials.asc file, and update it? But that should be tracked in its own issue probably.

When I originally submitted the PR, I reviewed the chapter and it seemed up-to-date except this part. But I will take another look.

[HonkingGoose]

When I originally submitted the PR, I reviewed the chapter and it seemed up-to-date except this part. But I will take another look.

Thank you for checking it over! Let us know what you find!

[mavaddat]

I have continued this PR in #1794