[sapphire] Improved stability handling invalid URLs

[tysmith]

Fixes:

Traceback (most recent call last):
  File "/home/worker/grizzly-auto-run/venv/lib/python3.10/site-packages/sapphire/worker.py", line 146, in handle_request
    request = Request.parse(raw_request)
  File "/home/worker/grizzly-auto-run/venv/lib/python3.10/site-packages/sapphire/worker.py", line 51, in parse
    url = urlparse(
  File "/usr/lib/python3.10/urllib/parse.py", line 400, in urlparse
    splitresult = urlsplit(url, scheme, allow_fragments)
  File "/usr/lib/python3.10/urllib/parse.py", line 500, in urlsplit
    _checknetloc(netloc)
  File "/usr/lib/python3.10/urllib/parse.py", line 441, in _checknetloc
    raise ValueError("netloc '" + netloc + "' contains invalid " +
ValueError: netloc '⁡<<=)𤱍᩿ﷺ٠𯄬Ⱥ㮺^=𖔠𯊖𯚇^=𯓚*=𐎭᷌ 󠳀ك%𝟯ᾂ٪℀�0𧸄ູ𯨾｠𯹕㔮𝅱‫𝬍𣥫%=𝋼&`𐇽𛒀𓪂٠𨕁゚R𯄎٪߫孁' contains invalid characters under NFKC normalization