build: Update module github.com/go-git/go-git/v6 to v6.0.0-alpha.1

[go-git-renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/go-git/go-git/v6	v6.0.0-20260114124804-a8db3a6585a6 → v6.0.0-alpha.1

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR has been generated by Renovate Bot.

[go-git-renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 3 additional dependencies were updated

Details:

Package	Change
github.com/ProtonMail/go-crypto	v1.3.0 -> v1.4.1
github.com/cloudflare/circl	v1.6.1 -> v1.6.3
github.com/kevinburke/ssh_config	v1.4.0 -> v1.6.0

[pjbgf]

@copilot fix the build error:

 Error: cmd/gogit/verify-pack.go:84:28: not enough arguments in call to idxfile.NewDecoder
	have (billy.File)
	want (io.Reader, "github.com/go-git/go-git/v6/plumbing/hash".Hash)

[Copilot]

@copilot fix the build error:

 Error: cmd/gogit/verify-pack.go:84:28: not enough arguments in call to idxfile.NewDecoder

...

Fixed in acb1817. Added the plumbing/hash import and updated the call to idxfile.NewDecoder(idxFile, hash.New(ch)) to match the new signature.

[pjbgf]

@copilot re-create this PR instead, avoid committing the binary into it.