Bump psutil from 5.6.1 to 5.6.6 in /docker/ot-import

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.6.1 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-5.6.1...release-5.6.6)

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

Author: dependabot[bot]

docker/ot-import/requirements.txt

@@ -24,7 +24,7 @@ more-itertools==5.0.0
 networkx==2.2
 numpy==1.16.2
 petl==1.6.8
-psutil==5.6.1
+psutil==5.6.6
 pyparsing==2.3.1
 pypeln==0.1.6
 pyrsistent==0.14.11