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Replace the setmatrix package's use of golang-set with a small local map-backed set implementation. The package already serializes access with its own mutex, so the external dependency was not buying us much and made this small utility harder to keep self-contained. Removing it trims the dependency surface and avoids carrying an otherwise single-purpose module for a narrow internal use case. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>