Bump kindling + domainfront for multi-URL config racing

[myleshorton]

Bumps kindling → 8563bcd and domainfront → 8c1f8ac, picking up domainfront#17: WithConfigURL is now variadic and races multiple config sources (first valid wins) — the client-side primitive for a China-reachable config mirror (getlantern/engineering#3721).

No radiance code change yet. This carries the capability to main; the mirror URL gets added to NewFronted's WithConfigURL once the mirror is publishing. go.mod / go.sum only; go build ./... (excl. the pre-existing cmd/lantern breakage) and the fronted tests pass.

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[Copilot]

Pull request overview

This PR updates Radiance’s Go module dependencies to pick up upstream support for racing multiple config sources via domainfront.WithConfigURL (now variadic), enabling future addition of a China-reachable config mirror without changing Radiance code yet.

Changes:

• Bump github.com/getlantern/domainfront to v0.0.0-20260722204513-8c1f8acfa715.
• Bump github.com/getlantern/kindling to v0.0.0-20260722205227-8563bcdd9b04.
• Update go.sum accordingly.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
go.mod	Updates domainfront and kindling versions to bring in multi-URL config racing support.
go.sum	Refreshes module checksums to match the updated dependency versions.

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