chore(deps): update golang:1.25.7 docker digest to 85c0ab0 (#1707)

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:1.25.7@sha256:cc737435e2742bd6da3b7d575623968683609a3d2e0695f9d85bee84071c08e6"
+      image: "golang:1.25.7@sha256:85c0ab0b73087fda36bf8692efe2cf67c54a06d7ca3b49c489bbff98c9954d64"
       cpu: "16"
       memory: "24G"
       ephemeralStorage: "40G"