[New git-credential-manager version] GCM 2.6.0

[github-actions]

Release GCM 2.6 (#1712)

**Changes:**

- Drop no longer needed workflows (#1659)
- Documentation fixes (#1664, #1697)
- Configurable GPG store path via Git config (#1698)
- Fix Visual Studio build problems and update dependencies (#1711)
- Support sending X5C with certificate auth (#1666)

https://github.com/git-ecosystem/git-credential-manager/releases/tag/v2.6.0

[dscho]

/open pr

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