Bump domainfront for multi-URL config racing

[myleshorton]

Bumps domainfront to pick up #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 kindling code change — kindling only wraps *domainfront.Client via WithDomainFronting. go.mod / go.sum only; go build ./... and go test ./... pass.

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Reviewing files that changed from the base of the PR and between ef87ee2 and dbaeba3.

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• go.sum is excluded by !**/*.sum

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• go.mod

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[Copilot]

Pull request overview

Updates the github.com/getlantern/domainfront dependency to pick up upstream support for racing multiple config URLs (first valid wins), which Kindling consumes indirectly via its WithDomainFronting wrapper around *domainfront.Client.

Changes:

• Bump github.com/getlantern/domainfront to v0.0.0-20260722204513-8c1f8acfa715 in go.mod.
• Update go.sum entries to match the new domainfront pseudo-version and checksums.

Reviewed changes

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

File	Description
go.mod	Updates the domainfront dependency version to the new pseudo-version.
go.sum	Refreshes checksum entries for the updated domainfront version.

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