Bump psutil from 5.0.1 to 5.6.6

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.0.1 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-5.0.1...release-5.6.6)

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

requirements.txt

@@ -87,7 +87,7 @@ pickleshare==0.7.4
 Pillow==7.1.0
 ply==3.9
 prompt-toolkit==1.0.9
-psutil==5.0.1
+psutil==5.6.6
 ptyprocess==0.5.1
 py==1.4.32
 pyasn1==0.1.9