minor #830 [Site] Upgrading deps for 2.8 (weaverryan)

This PR was merged into the 2.x branch.

Discussion
----------

[Site] Upgrading deps for 2.8

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | None
| License       | MIT

Upgrading ux.symfony.com deps for 2.8 :)

Commits
-------

3832e5d [Site] Upgrading deps for 2.8

Author: weaverryan