chore: bump buf build (backport #4002)

[mergify]

Description

• bump buf build to v1.34.0;
• fix integration test for plugins. The new buf is breaking the tests;
• fix the golden compare method parameters;

  ---

  This is an automatic backport of pull request chore: bump buf build #4002 done by Mergify.

[mergify]

Cherry-pick of 5c9966d has failed:

On branch mergify/bp/release/v28.x.y/pr-4002
Your branch is up to date with 'origin/release/v28.x.y'.

You are currently cherry-picking commit 5c9966d4.
  (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:   changelog.md
	modified:   integration/doctor/testdata/config-need-migrate.txt
	modified:   integration/doctor/testdata/existing-tools.go.txt
	modified:   integration/doctor/testdata/missing-tools.go.txt

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum

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