Bump psutil from 5.6.1 to 5.6.3

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.6.1 to 5.6.3.
- [Release notes](https://github.com/giampaolo/psutil/releases)
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.6.1...release-5.6.3)

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

requirements.txt

@@ -102,7 +102,7 @@ simplejson==3.16.0
 timeout-decorator==0.4.1
 
 # required by monitoring
-psutil==5.6.1
+psutil==5.6.3
 django-cors-headers==2.5.2
 django-multi-email-field<=0.5.1
 user-agents