Describe the bug
quickumls cannot be installed on Python 3.12 (default on Ubuntu 24.04 LTS) due to leveldb

To Reproduce

1. Deploy a venv for Python 3.12

2. pip install quickumls

3. Wheel compilation for leveldb fails with the following error:

         leveldb_object.cc: In function ‘int pyleveldb_str_eq(PyObject*, const char*)’:
         leveldb_object.cc:795:33: error: ‘PyUnicode_AS_UNICODE’ was not declared in this scope; did you mean ‘PyUnicode_AsUCS4’?
           795 |                 Py_UNICODE* c = PyUnicode_AS_UNICODE(p);
               |                                 ^~~~~~~~~~~~~~~~~~~~
               |                                 PyUnicode_AsUCS4
   
   

**Environment **

• OS: Ubuntu 24.04
• QuickUMLS version: 1.4
• UMLS version: N/A

Additional context
It sounds unlikely that py-leveldb will ever receive a fix. Its maintenance looks inactive. It could be worth swapping the leveldb dependency to something else like plyvel which looks maintained and has wheels for the latest versions of Python.