Fixed Compatiblity Issues with Python 3.9

[stegm]

According to #17, the code does not run with python 3.9. I updated tox to include 3.9 and also 3.12. I dropped 3.8 because it never worked and support for python will drop in October.

This PR contains code changes which makes it compatible with 3.9. Most of the changes fix the new typing syntax. In api.py the decorator for re-login has to be moved into a function instead a static method.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses compatibility issues with Python 3.9 and updates the supported Python versions. The main changes involve updating type hints, refactoring a decorator, and modifying the project configuration.

File-Level Changes

Change	Details	Files
Updated type hints for compatibility with Python 3.9	Replaced `list[Any]	dict[Any, Any]withUnion[list[Any], dict[Any, Any]]</li><li>Changed str
Refactored the _relogin decorator	Moved the _relogin decorator from a static method to a standalone function Updated the decorator implementation to work with the new location	pykoplenti/api.py
Updated project configuration for new Python versions	Added Python 3.9 and 3.12 to the tox environments Updated the list of supported Python versions in setup.cfg Modified the CI workflow to test against Python 3.9, 3.10, 3.11, and 3.12	doc/developer.md setup.cfg .github/workflows/ci.yaml

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[sourcery-ai]

Hey @stegm - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 4 issues found
• 🟢 Complexity: all looks good
• 🟡 Documentation: 1 issue found

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[sourcery-ai]

suggestion (testing): Update type hint in client_response_factory for Python 3.9 compatibility

This change is necessary for Python 3.9 compatibility. Consider adding a test case that specifically checks if the factory works correctly with different types of input (list, dict, and None) to ensure the change doesn't introduce any regressions.

Suggested change

	def factory(status: int = 200, json: list[Any] | dict[Any, Any] | None = None):
	def factory(
	status: int = 200,
	json: Union[list[Any], dict[Any, Any], None] = None
	) -> MagicMock:

[sourcery-ai]

suggestion (testing): Add test for Python 3.9 specific behavior

Since this PR is about fixing compatibility issues with Python 3.9, it would be beneficial to add a test case that specifically checks for correct behavior under Python 3.9, especially regarding the changes made to type hints and any other Python 3.9 specific modifications.

from typing import Any, Callable, Iterable, Union
from unittest.mock import ANY, MagicMock, call
import sys
import pytest

@pytest.mark.skipif(sys.version_info < (3, 9), reason="requires python3.9 or higher")
async def test_virtual_process_data_python39():
    # Test implementation for Python 3.9 specific behavior

[trsqr]

This seems to work for me on a system that only has Python 3.9.