Add Python 3.14 to the supported versions

[seratch]

Update the package metadata and CI builds

[seratch]

While the installation now passes, some of tests are still failing

[seratch]

=================================== FAILURES ===================================
________________________ test_sync_agent_hook_with_llm _________________________

    def test_sync_agent_hook_with_llm():
        hooks = AgentHooksForTests()
        model = FakeModel()
        agent = Agent(
            name="A", model=model, tools=[get_function_tool("f", "res")], handoffs=[], hooks=hooks
        )
        # Simulate a single LLM call producing an output:
        model.set_next_output([get_text_message("hello")])
>       Runner.run_sync(agent, input="hello")

tests/test_agent_llm_hooks.py:97: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
src/agents/run.py:416: in run_sync
    return runner.run_sync(
src/agents/run.py:723: in run_sync
    return asyncio.get_event_loop().run_until_complete(
           ^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <asyncio.unix_events._UnixDefaultEventLoopPolicy object at 0x7fb9d9b4cd70>

    def get_event_loop(self):
        """Get the event loop for the current context.
    
        Returns an instance of EventLoop or raises an exception.
        """
        if self._local._loop is None:
>           raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)
E           RuntimeError: There is no current event loop in thread 'MainThread'.

../../../.local/share/uv/python/cpython-3.14.0-linux-x86_64-gnu/lib/python3.14/asyncio/events.py:715: RuntimeError
_________________________ test_sync_run_hook_with_llm __________________________

    def test_sync_run_hook_with_llm():
        hooks = RunHooksForTests()
        model = FakeModel()
        agent = Agent(name="A", model=model, tools=[get_function_tool("f", "res")], handoffs=[])
        # Simulate a single LLM call producing an output:
        model.set_next_output([get_text_message("hello")])
>       Runner.run_sync(agent, input="hello", hooks=hooks)

tests/test_run_hooks.py:105: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
src/agents/run.py:416: in run_sync
    return runner.run_sync(
src/agents/run.py:723: in run_sync
    return asyncio.get_event_loop().run_until_complete(
           ^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <asyncio.unix_events._UnixDefaultEventLoopPolicy object at 0x7fb9d9b4cd70>

    def get_event_loop(self):
        """Get the event loop for the current context.
    
        Returns an instance of EventLoop or raises an exception.
        """
        if self._local._loop is None:
>           raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)
E           RuntimeError: There is no current event loop in thread 'MainThread'.

../../../.local/share/uv/python/cpython-3.14.0-linux-x86_64-gnu/lib/python3.14/asyncio/events.py:715: RuntimeError
=============================== warnings summary ===============================
.venv/lib/python3.14/site-packages/fastapi/routing.py:234
  /home/runner/work/openai-agents-python/openai-agents-python/.venv/lib/python3.14/site-packages/fastapi/routing.py:234: DeprecationWarning: 'asyncio.iscoroutinefunction' is deprecated and slated for removal in Python 3.16; use inspect.iscoroutinefunction() instead
    is_coroutine = asyncio.iscoroutinefunction(dependant.call)

.venv/lib/python3.14/site-packages/litellm/litellm_core_utils/logging_utils.py:160: 17 warnings
  /home/runner/work/openai-agents-python/openai-agents-python/.venv/lib/python3.14/site-packages/litellm/litellm_core_utils/logging_utils.py:160: DeprecationWarning: 'asyncio.iscoroutinefunction' is deprecated and slated for removal in Python 3.16; use inspect.iscoroutinefunction() instead
    if asyncio.iscoroutinefunction(func):

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=========================== short test summary info ============================
FAILED tests/test_agent_llm_hooks.py::test_sync_agent_hook_with_llm - RuntimeError: There is no current event loop in thread 'MainThread'.
FAILED tests/test_run_hooks.py::test_sync_run_hook_with_llm - RuntimeError: There is no current event loop in thread 'MainThread'.
============ 2 failed, 918 passed, 3 skipped, 18 warnings in 30.69s ============
make: *** [Makefile:29: coverage] Error 1

https://github.com/openai/openai-agents-python/actions/runs/18679862649/job/53258264262?pr=1961

[seratch]

I've removed tiktoken as it's no longer necessary to explicitly have

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