Fixed List[str] annotation in delete_branch feature

[nvoxland]

🚀 🚀 Pull Request

Impact

• Bug fix (non-breaking change which fixes expected existing functionality)
• Enhancement/New feature (adds functionality without impacting existing logic)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Fixes type annotation to avoid this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/s/work/deeplake/deeplake/__init__.py", line 19, in <module>
    from .api.dataset import dataset as api_dataset
  File "/Users/s/work/deeplake/deeplake/api/dataset.py", line 9, in <module>
    from deeplake.auto.unstructured.image_classification import ImageClassification
  File "/Users/s/work/deeplake/deeplake/auto/unstructured/image_classification.py", line 13, in <module>
    from deeplake.core.dataset import Dataset
  File "/Users/s/work/deeplake/deeplake/core/dataset/__init__.py", line 1, in <module>
    from .dataset import Dataset  # type: ignore
  File "/Users/s/work/deeplake/deeplake/core/dataset/dataset.py", line 22, in <module>
    from deeplake.util.version_control import (
  File "/Users/s/work/deeplake/deeplake/util/version_control.py", line 372, in <module>
    branch_name: str, all_branch_commits: list[str], dataset, storage
TypeError: 'type' object is not subscriptable