Update compatibility to include Drupal 10.

[rosiel]

GitHub Issue: (link)

Islandora/documentation#2235

What does this Pull Request do?

Makes Openseadragon Drupal 10 compatible.

What's new?

A in-depth description of the changes made by this PR. Technical details and
possible side effects.

• Changes x feature to such that y
• Added x
• Removed y
• Does this change require documentation to be updated?
• Does this change add any new dependencies?
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)?
• Could this change impact execution of existing code?

How should this be tested?

Install on Drupal 10 and give it an external Mirador URI.

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

[alxp]

Just one small notice when running PHPUnit tests:

Testing /Users/alexanderoneill/Sites/d10/web/modules/contrib/openseadragon/tests
..... 5 / 5 (100%)

Time: 00:05.333, Memory: 8.00 MB

OK (5 tests, 40 assertions)

Remaining self deprecation notices (5)

5x: The Drupal\Tests\openseadragon\Kernel\IIIFManifestParserTest::$modules property must be declared protected. See https://www.drupal.org/node/2909426
5x in DrupalListener::startTest from Drupal\Tests\Listeners

Alexanders-MBP:core alexanderoneill$

[rosiel]

i'll add D10 to the testing matrix first

[rosiel]

or after. whoops.

[rosiel]

I think that update c357901) should cover the deprecation notices you saw. The tests ran and I don't see any deprecation warnings in them now.