chore(deps): update golang:1.25.4 docker digest to f60eaa8 (#1456)

Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>

Author: elastic-renovate-prod[bot]

.buildkite/release.yml

@@ -1,7 +1,7 @@
 steps:
   - label: Release
     agents:
-      image: "golang:1.25.4@sha256:e68f6a00e88586577fafa4d9cefad1349c2be70d21244321321c407474ff9bf2"
+      image: "golang:1.25.4@sha256:f60eaa87c79e604967c84d18fd3b151b3ee3f033bcdade4f3494e38411e60963"
       cpu: "16"
       memory: "24G"
       ephemeralStorage: "20G"