refactor: Unify proxy iterator types · acts-project/acts@ee60730

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_simulation.py

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_trackfitting_kf.py

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_trackfitting_gsf.py

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_trackfitting_gx2f.py

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_trackfinding_1muon.py

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_trackfinding_4muon_50vertices.py

✅ Dataset generation succeeded: CI/physmon/workflows/physmon_trackfinding_ttbar_pu200.py

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