chore(deps): update mvdan.cc/unparam digest to 2fa3d84

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mvdan.cc/unparam	indirect	digest	5beb8c8 → 2fa3d84

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: backend/go.sum

go: downloading mvdan.cc/unparam v0.0.0-20260823230713-2fa3d841b0c8
go: finding module for package github.com/golangci/gofmt/gofmt
go: github.com/golangci/golangci-lint/v2/cmd/golangci-lint imports
	github.com/golangci/golangci-lint/v2/pkg/commands imports
	github.com/golangci/golangci-lint/v2/pkg/goformatters imports
	github.com/golangci/golangci-lint/v2/pkg/goformatters/gofmt imports
	github.com/golangci/gofmt/gofmt: module github.com/golangci/gofmt@latest found (v0.0.0-20260820135601-e84e05053792), but does not contain package github.com/golangci/gofmt/gofmt