Support python 3.13

[metalshanked]

Hi, thanks for this useful package.
Currently it does not seem to support Python 3.13

ERROR: Ignored the following versions that require a different python version: 0.1.0 Requires-Python <3.13,>=3.8; 0.1.2 Requires-Python <3.13,>=3.8; 0.1.4 Requires-Python <3.13,>=3.8
ERROR: Could not find a version that satisfies the requirement fastapi-throttle (from versions: none)
ERROR: No matching distribution found for fastapi-throttle

[AliYmn]

@metalshanked, thank you for the feedback — I’ve fixed this issue! #2