feat(checker): Add imagemagick

[qmfrederik]

No description provided.

[qmfrederik]

@terriko I addressed the merge conflict and the linting failure, would you mind re-approving the workflow?

[qmfrederik]

@terriko Looks like the "Testing / Tests that may fail due to network or HTML (pull_request)" test failed and the "Testing / Long tests on Python 3.10 (synchronous) (pull_request)" test was cancelled (?). Could you re-run those jobs?

[terriko]

I'm going to update this branch so you should get the long tests on 3.13, which should work better. I'm not too worried about the synch tests failing in this case since the scanner tests passed, but might as well be sure.

[qmfrederik]

Thanks @terriko . Looks like you'll still need to approve the workflow, though.

[terriko]

Done! (Sorry about forgetting to re-approve it. They changed the interface so I have to do that now but it still doesn't show for me that it's needed unless I refresh the page for some reason. ugh.)

[terriko]

Fixed the merge conflict, but of course now all the tests are going to run again. I know branch requirements are considered best practice but sometimes they're such a waste of time!