Proxy log scrubbing misses URL-encoded IPv6 addresses

The log scrubbing patterns (#21304 (closed), #40115 (closed)) miss IPv6 addresses in URLs, where : is encoded as %3A or %3a. URLs like these may be logged in the case of HTTP errors.

snowflake-webext!55 (comment 2851695)

error dialing relay: wss://snowflake.torproject.net/?client_ip=2001%3Adb8%3A4000%3A%3A1234 = dial tcp: lookup snowflake.torproject.net: no such host