Fix different python versions

[johannes-moegerle]

No description provided.

[Copilot]

Pull request overview

This PR addresses Python version compatibility issues to enable support for Python 3.9 through 3.13. The changes primarily involve fixing type imports and adding runtime type checks.

• Moved Self type import from typing to typing_extensions under TYPE_CHECKING blocks for compatibility with Python 3.9-3.10
• Added isinstance checks in utils.py to handle cases where int types don't have the .is_integer() method
• Updated CI workflow to test against all supported Python versions (3.9-3.13)

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/rydstate/angular/utils.py	Added isinstance(arg, int) checks before calling .is_integer() to prevent AttributeError on int types
src/rydstate/angular/angular_state.py	Moved Self import from typing to typing_extensions under TYPE_CHECKING for Python 3.9-3.10 compatibility
src/rydstate/angular/angular_ket.py	Moved Self import from typing to typing_extensions under TYPE_CHECKING for Python 3.9-3.10 compatibility
src/rydstate/__init__.py	Bumped version from 0.9.0 to 0.9.1 for this bug fix release
.github/workflows/testing.yml	Added test matrix to validate compatibility across Python 3.9-3.13

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