[spiral/scaffolder] Changing job payload type from array to mixed

[msmakouz]

Q	A
Bugfix?	✔️
Breaks BC?	❌
New feature?	❌
Issues	#943

What was changed

Changed the type of payload in the generated JobHandler from array to mixed.

use Spiral\Queue\JobHandler;

/**
 * Sample Job Handler
 */
final class SampleJob extends JobHandler
{
    public function invoke(string $id, mixed $payload, array $headers): void
    {
    }
}

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (cc53ed1) 83.95% compared to head (364d371) 83.94%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #992      +/-   ##
============================================
- Coverage     83.95%   83.94%   -0.01%     
  Complexity     6087     6087              
============================================
  Files           800      800              
  Lines         17141    17141              
============================================
- Hits          14390    14389       -1     
- Misses         2751     2752       +1     

Files Changed	Coverage Δ
...affolder/src/Declaration/JobHandlerDeclaration.php	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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