chore(deps): update golang:1.24.3 docker digest to 81bf592 (elastic#1151)

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:1.24.3@sha256:4c0a1814a7c6c65ece28b3bfea14ee3cf83b5e80b81418453f0e9d5255a5d7b8"
+      image: "golang:1.24.3@sha256:81bf5927dc91aefb42e2bc3a5abdbe9bb3bae8ba8b107e2a4cf43ce3402534c6"
       cpu: "16"
       memory: "24G"
       ephemeralStorage: "20G"