Add support for python 3.13

[claudious96]

Add support for Python 3.13 by raising the asyncio.QueueShutDown exception when the queue is shutdown and the methods put, put_nowait, get, and get_nowait are called.

A test was added to verify that the exception was correctly raised.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/calendar_queue/calendar_queue.py	90.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/calendar_queue/calendar_queue.py	84.25% <90.00%> (ø)