chore(deps): upgrade kway-go to v1.0.2

[achille-roussel]

Bumps github.com/achille-roussel/kway-go from v1.0.1 to v1.0.2.

kway is used by storage/merge.go (combining object listings across buckets) and storage/overlay.go (merging layered listings), both via kway.MergeFunc. No source changes were needed — the bump is confined to go.mod/go.sum.

Testing

go build ./... and go test -race ./... both run clean, with two caveats worth calling out:

• storage/gs/gsclient TestStreamingChunkPool fails, but it fails identically on main. It asserts zero bytes allocated per op and reports ~16 B/op regardless of this change. Pre-existing and unrelated.
• cmd/t4 TestScripts/serve failed once during the full parallel run (the t4 serve subprocess timed out binding its port under load), then passed 3/3 on re-run. A flake, not a regression.

Everything that actually exercises kway (./storage/..., including merge and overlay) passes under -race.

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