remove PHP84 deprecations

[JulienRAVIA]

Nouveau comportement

Supprime les dépréciations PHP84.

Détails des dépréciations

FILE: /home/jravia/code/rest-client-sdk/src/RestClient.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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  58 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
     |         | explicitly nullable instead. Found implicitly nullable parameter: $baseUrl.
 355 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
     |         | explicitly nullable instead. Found implicitly nullable parameter: $response.
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FILE: /home/jravia/code/rest-client-sdk/src/SdkClient.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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 79 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
    |         | explicitly nullable instead. Found implicitly nullable parameter: $unitOfWork.
 80 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
    |         | explicitly nullable instead. Found implicitly nullable parameter: $serializer.
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FILE: /home/jravia/code/rest-client-sdk/src/Mapping/ClassMetadata.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 67 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
    |         | explicitly nullable instead. Found implicitly nullable parameter: $repositoryName.
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FILE: /home/jravia/code/rest-client-sdk/src/Mapping/Attribute.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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 41 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
    |         | explicitly nullable instead. Found implicitly nullable parameter: $attributeName.
 42 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
    |         | explicitly nullable instead. Found implicitly nullable parameter: $type.
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FILE: /home/jravia/code/rest-client-sdk/src/Exception/RestException.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 39 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be
    |         | explicitly nullable instead. Found implicitly nullable parameter: $previous.
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FILE: /home/jravia/code/rest-client-sdk/src/Collection/Collection.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 14 | WARNING | When the magic __serialize() and __unserialize() methods are available and the code base does not need
    |         | to support PHP < 7.4, the implementation of the Serializable interface can be removed.
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