Update app-diagnostics-report.md

[TiloGit]

add year to the planned rollout date. Guess that can be removed if rollout is completed.

Description

Please include a summary of the change and which issue is fixed.

If you are a Boxer, please also reference the related DDOC or APIWG tickets. If you do not have a related Jira ticket and this is more than a bug fix, then create one now.

Fixes # (issue) Re DDOC-# (Jira ticket) Re APIWG-# (Jira ticket)

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own changes
• [x] I have run yarn lint to make sure my changes pass all linters
• [x] I have pulled the latest changes from the upstream developer branch

Contribution guidelines

For contribution guidelines, styleguide, and other helpful information please see the CONTRIBUTING.md file in the root of this project.

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