Add new Python licenses

[adriangonz]

What this PR does / why we need it:

One of our sub-dependencies, tensorboard (2nd level dep through tensorflow), has upgraded some of their respective deps (i.e. 3rd level dependencies of seldon-core). Updating the licenses to reflect that.

[seldondev]

Tue Sep 29 08:26:00 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2500/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2500 --build=2

[seldondev]

Tue Sep 29 08:26:13 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2500/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2500 --build=1

[adriangonz]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adriangonz

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [adriangonz]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment