Bump psutil from 5.4.8 to 5.6.6 in /chat_front (#3)

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.4.8 to 5.6.6.
- [Release notes](https://github.com/giampaolo/psutil/releases)
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.4.8...release-5.6.6)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

chat_front/requirements-docker.txt

@@ -1,4 +1,4 @@
 -r requirements.txt
 gevent==1.4.0
 gunicorn==19.9.0
-psutil==5.4.8
+psutil==5.6.6