chore: Update .buildkite/pipeline.yml

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Author: github-actions[bot]

.buildkite/pipeline.yml

@@ -255,7 +255,7 @@ steps:
     artifact_paths:
       - "build/TEST-go-unit.cov"
     agents:
-      image: "golang:1.24.5"
+      image: "golang:1.24.6"
     depends_on:
       - unit-tests
       - extended-windows