feat: Update to latest EC recommendations

[jrconlin]

• Update crypt object references to functions
• Format code using black for consistency

Closes #105

[Copilot]

Pull Request Overview

This PR updates the library to conform to the latest EC (Elliptic Curve) recommendations and ensures code consistency through black formatting. The main focus is updating cryptographic object references to use function calls instead of direct object references.

• Updates EC curve object references to function calls (ec.SECP256R1 → ec.SECP256R1())
• Applies black code formatting for consistent style throughout the codebase
• Bumps version from 1.9.2 to 1.9.3

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
python/pyproject.toml	Version bump to 1.9.3
python/py_vapid/init.py	Updates EC curve references to function calls and applies black formatting

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