fix(deps): update github.com/shortlink-org/go-sdk/config digest to 40ae8b9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/shortlink-org/go-sdk/config	require	digest	82e9073 → 40ae8b9

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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: billing/go.sum

Command failed: go get -t ./...
go: module github.com/shortlink-org/go-sdk/config@v0.0.0-20260429091243-40ae8b9e1433 requires go >= 1.26.2; switching to go1.26.3
go: downloading go1.26.3 (linux/amd64)
go: downloading github.com/shortlink-org/go-sdk/config v0.0.0-20260429091243-40ae8b9e1433
go: downloading golang.org/x/sync v0.20.0
go: downloading github.com/jackc/pgx/v5 v5.9.1
go: downloading github.com/Unleash/unleash-go-sdk/v6 v6.4.0
go: downloading github.com/stretchr/objx v0.5.3
go: downloading golang.org/x/sys v0.43.0
go: downloading golang.org/x/text v0.36.0
go: downloading github.com/launchdarkly/eventsource v1.10.0
go: downloading github.com/Masterminds/semver/v3 v3.4.0
go: downloading github.com/hashicorp/golang-lru/v2 v2.0.7
go: downloading github.com/hashicorp/golang-lru v0.5.1
go: github.com/shortlink-org/billing/billing/internal/di imports
	github.com/shortlink-org/shortlink/pkg/observability/monitoring: cannot find module providing package github.com/shortlink-org/shortlink/pkg/observability/monitoring
go: github.com/shortlink-org/billing/billing/internal/usecases/account imports
	github.com/shortlink-org/shortlink/pkg/pattern/specification: cannot find module providing package github.com/shortlink-org/shortlink/pkg/pattern/specification
go: github.com/shortlink-org/billing/billing/internal/usecases/tariff imports
	github.com/shortlink-org/shortlink/pkg/logger/field: cannot find module providing package github.com/shortlink-org/shortlink/pkg/logger/field
go: github.com/shortlink-org/billing/billing/internal/usecases/account tested by
	github.com/shortlink-org/billing/billing/internal/usecases/account.test imports
	github.com/shortlink-org/go-sdk/logger/config: cannot find module providing package github.com/shortlink-org/go-sdk/logger/config