pip prod(deps): update psutil requirement

Updates the requirements on [psutil](https://github.com/giampaolo/psutil) to permit the latest version.
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.1.0...release-6.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -3,7 +3,7 @@ pip>=9.0.1
 numpy>1.16
 sympy>=1.9,<1.13
 cached-property
-psutil>=5.1.0,<6.0
+psutil>=5.1.0,<7.0
 py-cpuinfo<10
 cgen>=2020.1
 codepy>=2019.1