Remove last vestiges of mock.mock

[s-t-e-v-e-n-k]

Pull Request check-list

Please make sure to review and check all of these items:

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

Description of change

With the minimum Python version now being high enough to drop the usage of the external mock module, switch to unittest.mock everywhere.

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[petyaslavova]

Hi @s-t-e-v-e-n-k, thank you for your contribution! Can you please check the failing tests - the async tests have some issues with the Mock object? Thanks!