HeaderParameter constraint-validators receive array value by default

[G0URAB]

API Platform version(s) affected: 4.3.17

Description
The symfony constraint validators e.g. Symfony\Component\Validator\Constraints\NotBlankValidator receive array value by default. Because of that if we pass empty string then validation does not work. Is this a bug or a feature?

How to reproduce

        parameters: [
                'foo' => new HeaderParameter(
                    required: true,
                    constraints: [new NotBlank(message: 'foo missing from header')]
                ),
            ],

Possible Solution

        parameters: [
                'foo' => new HeaderParameter(
                    required: true,
                    constraints: [new NotBlank(message: 'foo missing from header')],
                    nativeType: new BuiltinType(typeIdentifier: TypeIdentifier::STRING)
                ),
            ],

Additional Context
MR to improve doc: api-platform/docs#2322