Update psutil requirement from ~=5.8.0 to ~=5.9.3

Updates the requirements on [psutil](https://github.com/giampaolo/psutil) to permit the latest version.
- [Release notes](https://github.com/giampaolo/psutil/releases)
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.8.0...release-5.9.3)

---
updated-dependencies:
- dependency-name: psutil
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -6,5 +6,5 @@ python-pppd==1.0.3
 python-sdk-auth~=0.3.0
 pyudev~=0.22.0
 pyusb~=1.1.1
-psutil~=5.8.0
+psutil~=5.9.3
 requests~=2.25.1