LoadBalancer parser doesn't support IPv6

[svix-jbrown]

When processing a load balancer line:

Traceback (most recent call last):
  File "log_processer.py", line 22, in <module>
    for entry in  parser.parse([line]):
  File "/Users/jbrown/.cache/uv/archive-v0/EZ6rMZIMt9df_Mnfcd4lK/lib/python3.11/site-packages/aws_log_parser/interface.py", line 92, in parse
    yield from log_entries
  File "/Users/jbrown/.cache/uv/archive-v0/EZ6rMZIMt9df_Mnfcd4lK/lib/python3.11/site-packages/aws_log_parser/interface.py", line 73, in parse_csv
    *[
     ^
  File "/Users/jbrown/.cache/uv/archive-v0/EZ6rMZIMt9df_Mnfcd4lK/lib/python3.11/site-packages/aws_log_parser/interface.py", line 74, in <listcomp>
    to_python(value, field)
  File "/Users/jbrown/.cache/uv/archive-v0/EZ6rMZIMt9df_Mnfcd4lK/lib/python3.11/site-packages/aws_log_parser/parser.py", line 75, in to_python
    ip, port = value.split(":")