agree to contributor agreement

[svennd]

needed if these PR's get merged : #6419 #6320

Please note

Please read this information carefully. You can run ./scripts/pre-commit.php to check your code before submitting.

• Have you signed the Contributors agreement - please do NOT submit a pull request unless you have (signing the agreement in the same pull request is fine). Your commit message for signing the agreement must appear as per the docs.
• Have you followed our code guidelines?

Testers

If you would like to test this pull request then please run: ./scripts/github-apply <pr_id>, i.e ./scripts/github-apply 5926

[scrutinizer-notifier]

The inspection completed: No new issues

[laf]

@svennd You need to put the commit message exactly like it is in the contributors document.