Bump ember-page-title from 4.0.5 to 5.1.0

Bumps [ember-page-title](https://github.com/adopted-ember-addons/ember-page-title) from 4.0.5 to 5.1.0.
- [Release notes](https://github.com/adopted-ember-addons/ember-page-title/releases)
- [Commits](ember-cli/ember-page-title@4.0.5...5.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]