feat: declare python 3.14 support

[danfimov]

• Add 3.14 to test suilt
• Declare support in tags
• Fix warning in tests with 3.14 about asyncio.iscoroutinefunction deprecation in 3.16

[Copilot]

Pull request overview

This PR adds support for Python 3.14 by updating the test matrix, classifiers, and fixing compatibility issues. The changes include adapting the coroutine function detection logic for Python 3.14's improved inspect.iscoroutinefunction, fixing test declarations that were incorrectly marked as async, and adding an ensure_ascii parameter to the JSON serializer.

Key changes:

• Added Python 3.14 to the CI test matrix and package classifiers
• Updated coroutine function detection to use inspect.iscoroutinefunction for Python 3.14+
• Fixed JSON serializer tests to be synchronous (removed unnecessary async declarations)
• Added ensure_ascii parameter to JSONSerializer class with corresponding tests

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/serializers/test_json_serializer.py	Corrected test functions from async to sync, removed PLR2004 noqa comments (now globally ignored), and added parametrized test for ensure_ascii parameter
taskiq/serializers/json_serializer.py	Added ensure_ascii parameter to JSONSerializer constructor and applied it in dumpb method
taskiq/receiver/receiver.py	Added Python version detection and conditional use of inspect.iscoroutinefunction for Python 3.14+ to address coroutine detection improvements
pyproject.toml	Added Python 3.14 classifier and globally ignored PLR2004 (magic value) rule for all test files
.github/workflows/test.yml	Added Python 3.14 to the test matrix

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