Adjust cast and test against PHP 8.5

[dwightwatson]

Brief Summary of Changes

I upgraded my project to PHP 8.5 and started seeing deprecation warnings for the (boolean) cast:

  Non-canonical cast (boolean) is deprecated, use the (bool) cast instead

  at vendor/cloudinary/transformation-builder-sdk/src/Transformation/Qualifier/QualifiersAction.php:255
    251▕         $variables = ArrayUtils::get($options, 'variables', []);
    252▕ 
    253▕         $varQualifiers = [];
    254▕         foreach ($options as $key => $value) {
  ➜ 255▕             if (Variable::isVariable($key)) {
    256▕                 $varQualifiers[] = Variable::set($key, Expression::expression($value));
    257▕             }
    258▕         }
    259▕ 

This PR simply updates the (boolean) casts to (bool) which should be backwards compatible. It also updates the workflow to test against PHP 8.5.

What does this PR address?

• GitHub issue (Add reference - #XX)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No

Reviewer, please note:

N/A

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all the tests pass.