Update grafana-dashboards to 1.9.0

What does this MR do?

New update adds puma_active_connections instance labeling to the rails-app dashboard. (Some of the dashboards like the omnibus overview still don't work with GitLab 14.0, but the rails-app dashboard should be working with this version)

Related issues

Closes: #6443 (closed)

Test plan

1. Install the package
2. Navigate to the /-/grafana endpoint and login
3. Go to the rails app dashboard.
4. Validate that the your instance is available in the dropdown under the instances dropdown on the dashboard

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for the GitLab Chart opened