bump radiance

[garmr-ulfr]

This pull request updates several dependencies in the go.mod file to newer versions. These updates include both direct and indirect dependencies, which may bring in bug fixes, new features, or other improvements from upstream projects.

Dependency updates:

• Upgraded github.com/getlantern/radiance to commit b9df7d613b1a
• Upgraded github.com/getlantern/kindling to commit 21f8b144afab
• Upgraded github.com/getlantern/lantern-box to version v0.0.86
• Upgraded github.com/getlantern/lantern-water to commit 958775d51395
• Upgraded github.com/getlantern/samizdat to commit 5ea8ae61ddbf

[Copilot]

Pull request overview

This PR updates the direct github.com/getlantern/radiance dependency and associated transitive GetLantern modules in the Go module graph.

Changes:

• Bumps radiance to pseudo-version ending in b9df7d613b1a.
• Updates indirect dependencies: kindling, lantern-box, lantern-water, and samizdat.
• Refreshes matching go.sum entries for the updated module versions.

Reviewed changes

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

File	Description
go.mod	Updates the direct radiance dependency and related indirect dependency versions.
go.sum	Updates checksums for the bumped modules.

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