Update gitlab-triage to 1.43.1

What does this MR do and why?

Upgraded the gem to include the changes from gitlab-org/ruby/gems/gitlab-triage!326 (merged). This should fix the label-jihu-contributions job with the updated GraphQL query.

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review