Utils: Upgrade mistune

[MackHalliday]

User Story - Business Need

• Ticket is understood, and QA has been contacted (if the ticket has a QA label).

During a regular dependency update, upgrading mistunes from 3.0.2 to 3.1.0 resulted in two failing tests. We need to update mistunes and correct the failing tests.

User Story(ies)

As a Notification-Utils developer
I want upgrade mistunes 3.0.2 to the latest version
So that our application with continue to be secure.

Additional Info and Resources

• Update mistunes from 3.0.2 to 3.1.0, running ./scripts/bootstrap.sh and then ./scripts/run_tests.sh results in following failing tests.

- If updating beyond 3.1.0 further updates may be necessary

Acceptance Criteria

• Mistunes is upgraded to the latest version
• Code is updated to resolve failing tests
• Version number in Notification-Utils is updated
• Updated Notification-Utils is pulled into Notification-API thru Poetry and regression tests pass
• PR for Notification-API with update Notification-Utils is submitted once Notification-Utils PR is approved
• This work is added to the sprint review slide deck (key win bullet point and demo slide)

QA Considerations

• Work with developer to understand the test failures and how to validate outside of the unit tests that the feature works.

Potential Dependencies

This is dependent on:

• Template unit testing part 1
• Template unit testing part 2