Bump psutil from 5.9.3 to 5.9.4

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.9.3 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-5.9.3...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>

requirements.txt

@@ -1,5 +1,5 @@
 robotframework==6.0
 selenium==3.141.0
 robotframework-appiumlibrary==1.6.4
-psutil==5.9.3
+psutil==5.9.4
 Appium-Python-Client==1.3.0