Upgrade to 3.10 syntax

[dbanty]

No description provided.

[Copilot]

Pull Request Overview

This pull request upgrades the codebase to Python 3.10+ syntax by replacing the legacy typing.Union and typing.Optional syntax with modern pipe union operators (|), removing the typing-extensions dependency, and updating the minimum Python version requirement from 3.9 to 3.10. It also adds from __future__ import annotations to generated model files to enable forward reference compatibility.

Key changes:

• Replaced Union[X, Y] with X | Y and Optional[X] with X | None throughout the codebase
• Updated minimum Python version to 3.10 across all configuration files
• Removed typing-extensions dependency
• Added from __future__ import annotations import to generated models
• Updated union type sorting to use pipe operators with case-insensitive alphabetical ordering

Reviewed Changes

Copilot reviewed 235 out of 239 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Updated minimum Python version to 3.10 and removed typing-extensions dependency
openapi_python_client/templates/*.jinja	Updated templates to use pipe union syntax and added from __future__ import annotations
openapi_python_client/parser/**/*.py	Converted Union/Optional syntax to pipe operators throughout parser code
openapi_python_client/schema/**/*.py	Updated OpenAPI schema models to use modern type annotation syntax
tests/**/*.py	Updated test files to use pipe operators and removed Union/Optional imports
integration-tests/**/*.py	Updated integration test files and generated clients to match new syntax
end_to_end_tests/**/*.py	Updated end-to-end test files and golden records with new type annotation syntax

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