Fixing two deprecations

[vahid75]

Description:

• Replace mock with unittest.mock (Closes Replace mock with unittest.mock #1207)
• Fix a failed testcase (It used a deprecated Django TestCase method)

[openedx-webhooks]

Thanks for the pull request, @vahid75!

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[vahid75]

Do I have to do something about "needs test run"? @mphilbrick211

[mphilbrick211]

Do I have to do something about "needs test run"? @mphilbrick211

Hi @vahid75! No, we can run the tests on our side. Just trying to catch up from the holidays. They should be all set by early next week.