chore(deps): bump golang from 1.25.1 to 1.25.2 in /.buildkite

Bumps golang from 1.25.1 to 1.25.2.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.25.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.buildkite/Dockerfile.build

@@ -1,4 +1,4 @@
-FROM golang:1.25.1@sha256:d7098379b7da665ab25b99795465ec320b1ca9d4addb9f77409c4827dc904211
+FROM golang:1.25.2@sha256:1c91b4f4391774a73d6489576878ad3ff3161ebc8c78466ec26e83474855bfcf
 
 COPY --from=goreleaser/goreleaser-pro:v2.9.0@sha256:adf70d3f53233855f6091c58c2e3f182fd41311fe322cbf3284994bb6991a53d /usr/bin/goreleaser /usr/local/bin/goreleaser
 COPY --from=ghcr.io/ko-build/ko:20b15e67194215721faba356b857fcf5d621dfaa /ko-app/ko /usr/local/bin/ko