fix: #3611996 Readonly/private constructor-promoted service properties break...

Andrii Sakhaniukrequested to merge
issue/ai_audio_generator-3611996:3611996-readonlyprivate-constructor-promoted-service into 1.0.x

fix: #3611996 Readonly/private constructor-promoted service properties break DependencySerializationTrait (fatal errors + PHPStan failures)

Closes #3611996

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