Test on Drupal 10.3 and PHP 8.3.

[rosiel]

GitHub Issue: (link)

• Other Relevant Links (Google Groups discussion, related pull requests,
  Release pull requests, etc.)
• Slack convo: https://islandora.slack.com/archives/C04DBSD9J4F/p1709825383171759

What does this Pull Request do?

Tests now run on PHP 8.1, 8.2, and 8.3 and Drupal 10.1, 10.2, and 10.3-dev. (except PHP 8.3 x Drupal 10.1, that's not compatible)

What's new?

• Does this change add any new dependencies? no
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)? no
• Could this change impact execution of existing code? no

How should this be tested?

• Tests should pass.

Documentation Status

• Does this change existing behaviour that's currently documented? no
• Does this change require new pages or sections of documentation? no
• Who does this need to be documented for? no
• Associated documentation pull request(s): ___ or documentation issue ___

Additional Notes:

Any additional information that you think would be helpful when reviewing this
PR.

Interested parties

Tag (@ mention) interested parties or, if unsure, @Islandora/committers