Log Message:
grafana: Update to 7.1.5.

The release notes are too long and contain too many hyperlinks to be useful in
this commit message, so please see these URLs for an overview of changes in
each major and minor release since 6.7.3.

  https://community.grafana.com/t/release-notes-v7-1-x/32967
  https://community.grafana.com/t/release-notes-v7-0-x/29381
  https://community.grafana.com/t/release-notes-v6-7-x/27119