chore(ruff): use names not magic numbers. This one names the 32 chars as being equivalent to 256 bytes Also adds the missing http_.client.TOO_MANY_REQUESTS under python 2 to http_. It allows me to use a symbolic name and not have to touch client.py code when I remove python2 support from http_. Also the prior checkin had a bogus commit message. Sigh, time to step away from the computer today 8-). It replaced a magic number with MAX_MIME_EXTENSION_LENGTH which was set to a better magic number derived by parsing extensions in /etc/mime.types.

# ruff: noqa: F401  - unused imports
try:
    # used for python2 and python 3 < 3.13
    import cgi
    from cgi import FieldStorage, MiniFieldStorage
except ImportError:
    # use for python3 >= 3.13
    from roundup.anypy.vendored import cgi
    from roundup.anypy.vendored.cgi import FieldStorage, MiniFieldStorage