Add php 8.2; remove php 7.4 from testing matrix

[rosiel]

GitHub Issue: Islandora/documentation#2262

• Other Relevant Links (Google Groups discussion, related pull requests,
  Release pull requests, etc.)
  Discussed at Committers Call Oct 18, 2023

What does this Pull Request do?

Adds PHP 8.2 and to the testing matrix.

How should this be tested?

Check the tests! Likely they will fail, and/or reveal some deprecations and other things we need to take care of. This should probably be merged anyway and the tests dealt with separately.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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