remove hard code version as it's not necessary

[kaibocai]

Issue describing the changes in this PR

remove hard code worker version in pipeline, as it's not carry any useful info with it. Change it to v4 which should benefits when later automated the release process.

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

Additional information

Additional PR information

[shreyas-gopalakrishna]

LGTM!