Refactor to use ImageIOLoadException from brainglobe_utils

[K-Meech]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
brainreg currently has a LoadFileException class that should be refactored into brainglobe-utils, and imported from there

What does this PR do?
This PR uses the refactored ImageIOLoadException from brainglobe-utils

References

For #180
Related to refactoring in brainglobe/brainglobe-utils#59

How has this PR been tested?

Tests were updated, and all pass locally.

Is this a breaking change?

No

Does this PR require an update to the documentation?

No

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[willGraham01]

This will need to wait for a new release of brainglobe-utils after brainglobe/brainglobe-utils#59 (comment) is merged in for the CI to pass right?

In which case, you'll want to update the pyproject.toml to pin the new version of brainglobe-utils as a minimum requirement (once it has been released of course). Then the CI should pass after being forced to fetch the new version.

[alessandrofelder]

Lovely!