[tommey]

Makes the package free of deprecations on PHP 8.4 and 8.5, and keeps it that way.

Fix

UnexpectedResponseException::__construct() declared Throwable $previous = null. PHP 8.4 deprecated implicitly nullable parameters, so every client generated by api-client-generator raised an E_DEPRECATED on PHP 8.4+:

• 2.1.0–2.3.0: on the first non-2xx response or undecodable body in each process
• 2.0.0: on the first request of each process, because ResponseExceptionFactory loads the exception classes

The parameter is now ?Throwable $previous = null. The meaning and signature stay the same, and the ? syntax has worked since PHP 7.1 (this package requires ^7.4 || ^8.0). This is the only change in src/, so it qualifies as a patch release: 2.3.1, with a CHANGELOG entry.

Test tooling

• PHPUnit 9.5.26 → 9.6.37 (lock only; ^9.5 is unchanged). 9.5.26 raises the same PHP 8.4+ deprecation inside PHPUnit itself, so the suite could not run deprecation-free on 8.5. The lock was resolved against PHP 7.4, so the 7.4/8.0/8.1 jobs still install from it.
• convertDeprecationsToExceptions="true", so any future deprecation fails the build instead of being hidden.
• New CI job: Tests on PHP 8.5.

Verification

• PHP 8.5.10 lint of src/ and test/: the deprecation shows before the change and nothing shows after.
• The suite passes on PHP 7.4, 8.1 and 8.5 with deprecations turned into exceptions (20 tests, 48 assertions), including an 8.5 run with pcov coverage enabled.
• Runtime check of clients generated by api-client-generator 11.2.2 (targets 7.4, 8.1 and 8.3) on PHP 8.5: this package was the only source of deprecations, and there are none with this change.

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