fix: Invalid concurrent-processing return type

[caffeine-addictt]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Breaking Change
• Documentation Update

Description

• Fix invalid return type with ConcurrentProcessing

Related Tickets & Documents

• Closes [Bug] Concurrent Processing return type marked as List[Data_T] instead of List[Target_T] #136

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Added/updated tests?

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Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have incremented the version according to semantic versioning.
• I have updated the changelog accordingly.