[FIX]: deprecated QBytesArray::append(const QString&)

[Amit0617]

Description

Fixes #5925

Checklist

• [ ] Make sure that you are listed in the AUTHORS file
• [ ] Add relevant changes and new features to the CHANGELOG file
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] New and existing unit tests pass locally with my changes
• [ ] Updated or added python bindings for changed or new classes. (Tick if no updates were necessary.)

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Advanced commands (admins / reviewer only)

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