Bump psutil from 5.9.0 to 5.9.4

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.9.0 to 5.9.4.
- [Release notes](https://github.com/giampaolo/psutil/releases)
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.9.0...release-5.9.4)

---
updated-dependencies:
- dependency-name: psutil
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -4,7 +4,7 @@ black==22.3.0
 discord.py @ git+https://github.com/Rapptz/discord.py@d6004363784478538f8c2e3049ca59306f7da9a4
 isort==5.10.1
 jishaku==2.5.0
-psutil==5.9.0
+psutil==5.9.4
 uvloop==0.16.0
 feedparser==6.0.8
 python-dateutil==2.8.2