build: Update github.com/go-git/go-git-fixtures/v5 digest to eda62fa

[go-git-renovate]

• Rebase PR onto main branch
• Fix fixture.Idx() and fixture.Packfile() calls to handle the new (billy.File, error) return signatures in go-git-fixtures v5
• Build verified successfully

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[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):

• 1 additional dependency was updated

Details:

Package	Change
github.com/go-git/go-billy/v6	v6.0.0-20260114122816-19306b749ecc -> v6.0.0-20260226131633-45bd0956d66f

[pjbgf]

@copilot rebase this PR and fix the calls to the go-git-fixtures using the new signatures.

[Copilot]

@copilot rebase this PR and fix the calls to the go-git-fixtures using the new signatures.

Done. Rebased onto main and updated the openPack function in cmd/gogit/verify-pack.go to handle the new (billy.File, error) return signatures for fixture.Idx() and fixture.Packfile() (commit 497fc77).