fix: upgrade @umbraco-cms/backoffice from 16.0.0-rc5 to 16.0.0

Snyk has created this PR to upgrade @umbraco-cms/backoffice from 16.0.0-rc5 to 16.0.0.

See this package in npm:
@umbraco-cms/backoffice

See this project in Snyk:
https://app.snyk.io/org/jcdcdev/project/4f1f43ed-d0a7-4b78-aa38-ed255e8e6435?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot