[BUG][PHP] `HeaderSelector` reorders `Accept` formats

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

HeaderSelector reorders Accept formats.
When provided the following input:

$accept = [
    'application/ld+json',
    'application/json',
    'text/html', 
];

It outputs the following string:
"application/json,application/ld+json;q=0.9,text/html;q=0.8

This causes the API client to produce an empty response object because it fails to deserialize plain JSON.

openapi-generator version

master

OpenAPI declaration file content or url

Petstore example from master.

Generation Details

Petstore example from master.

Steps to reproduce

I wrote a little test using the HeaderSelector from master:
https://3v4l.org/JphEQ

$accept = [
    'application/ld+json',
    'application/json',
    'text/html', 
];

$selector = new HeaderSelector();
$headers = $selector->selectHeaders($accept, 'application/json', false);
$accept = $headers['Accept'];

var_dump($accept);

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/4636
https://github.com/OpenAPITools/openapi-generator/issues/5163
https://github.com/OpenAPITools/openapi-generator/issues/12926
https://github.com/OpenAPITools/openapi-generator/pull/4684
https://github.com/OpenAPITools/openapi-generator/pull/13844

Suggest a fix

It seems to me that application/ld+json should be preserved as the first format to accept.

Read samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php and reproduce the supplied selectHeaders call with the listed Accept formats. Done means the generated Accept header preserves application/ld+json first instead of reordering it ahead of application/json, while confirming the reported output changes.