Release v12.1.1

[MarcinOrlowski]

No description provided.

[Copilot]

Pull Request Overview

This PR prepares the v12.1.1 release by addressing PHP 8.4 deprecation warnings for non-nullable parameters with default null, updating docs, and bumping the package version.

• Convert several method parameters from int to ?int to silence PHP 8.4 deprecations.
• Add a CHANGELOG entry for v12.1.1.
• Bump composer.json version to 12.1.1.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/Traits/TestingHelpers.php	Allow $expected_http_code to be nullable in getResponseSuccessObject
src/ResponseBuilder.php	Make $http_code, $json_opts, and $api_code nullable in error() and asSuccess()
docs/CHANGES.md	Added v12.1.1 entry for PHP 8.4 deprecation fixes
composer.json	Updated package version to 12.1.1

Comments suppressed due to low confidence (5)

tests/Traits/TestingHelpers.php:158

• The docblock for getResponseSuccessObject doesn’t list the newly nullable $expected_http_code param. Please add @param int|null $expected_http_code to keep docs in sync with the signature.

                                             ?int    $expected_http_code = null,

src/ResponseBuilder.php:122

• Update the docblock above error() to reflect @param int|null $http_code and @param int|null $json_opts since these parameters are now nullable.

                                 ?int   $http_code = null,

src/ResponseBuilder.php:142

• The docblock for asSuccess() still lists @param int $api_code; please change it to @param int|null $api_code to match the updated signature.

    public static function asSuccess(?int $api_code = null): self

tests/Traits/TestingHelpers.php:158

• [nitpick] Consider adding a test case where $expected_http_code is explicitly null to ensure getResponseSuccessObject handles nullable input as intended.

                                             ?int    $expected_http_code = null,

src/ResponseBuilder.php:122

• [nitpick] Add unit tests for error() with default null values for $http_code and $json_opts to verify default behavior hasn’t changed.

                                 ?int   $http_code = null,