chore(deps): update golang docker tag to v1.25.4 (#1423)

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:1.25.3@sha256:6d4e5e74f47db00f7f24da5f53c1b4198ae46862a47395e30477365458347bf2"
+      image: "golang:1.25.4@sha256:5d73b7b83dd6e0258ff62832c93b6ea208fbb7727985d265fb49f75f81fc3d1f"
       cpu: "16"
       memory: "24G"
       ephemeralStorage: "20G"