[9.0] (backport #18083) upgrade golang to 1.25

[mergify]

Exhaustive test suite: https://buildkite.com/elastic/logstash-exhaustive-tests-pipeline/builds/2405/steps/canvas

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This is an automatic backport of pull request #18083 done by Mergify.

[mergify]

Cherry-pick of 398a66c has failed:

On branch mergify/bp/9.0/pr-18083
Your branch is up to date with 'origin/9.0'.

You are currently cherry-picking commit 398a66cb.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docker/templates/IronbankDockerfile.erb

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docker/templates/Dockerfile.erb

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 22d9524

cc @jsvd