Add floatformat to list of fuzzed functions.

[personnumber3377]

Hi!

I discovered CVE-2024-41989 (https://hackerone.com/reports/2644244) with your fuzzer. I noticed that the floatformat function (from django/template/defaultfilters.py) wasn't in the list of fuzzed functions, so I added it and it found that DOS vulnerability.

Thanks in advance for your response!