Log Message:
www/squid6: update to 6.4

Several security fixes:

	SQUID-2023:1
	SQUID-2023:2
	SQUID-2023:3
	SQUID-2023:5

Changes in squid-6.4 (22 Oct 2023):

- Regression: Restore support for legacy cache_object cache manager requests
- Regression: Do not use static initialization to register modules
- Bug 5301: cachemgr.cgi not showing new manager interface URLs
- Bug 5300: cachemgr.cgi assertion
- Fix stack buffer overflow when parsing Digest Authorization
- Fix userinfo percent-encoding
- Fix store_client caller memory leak on certain errors
- Fix validation of certificates with CN=*
- Fix handling of large stored response headers
- Miss if a HTTP/304 update would exceed reply_header_max_size
- RFC 9112: Improve HTTP chunked encoding compliance
- HTTP: Improve handling of empty lines received prior to request-line
- Y2038: improve printing of time settings
- Extend cache_log_message to problematic from-helper annotations
- ... and several Continuous Integration improvements