DEVO-1899: update cython and python versions

[dmzobel]

https://simondata.atlassian.net/browse/DEVO-1899

This change regenerates src files using Cython 0.29.37, which should improve compatibility for later Python versions (3.10-3.11).

This is the process I followed:

1. Install Cython locally
2. Run ./update_c.sh from the root of this repository
3. After noticing the below warnings when running the script, I added # cython: language_level=3 to both src/chat_trie.pxd and src/hat_trie.pyx

/Users/marshall/Library/Python/3.12/lib/python/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /Users/marshall/git/Radico/hat-trie/src/hat_trie.pyx
  tree = Parsing.p_module(s, pxd, full_module_name)
/Users/marshall/Library/Python/3.12/lib/python/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /Users/marshall/git/Radico/hat-trie/src/chat_trie.pxd

4. Re-ran ./update_c.sh