Remove from __future__ import annotations in entity helper

[epenet]

Proposed change

Based on https://peps.python.org/pep-0649/ and https://peps.python.org/pep-0749/

from __future__ import annotations is no longer needed for forward reference in Python 3.14

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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