www/squid: update to 6.6

ChangeLog: http://www.squid-cache.org/Versions/v6/squid-6.6-RELEASENOTES.html

• TLS ServerHello
• Log TLS Communication Secrets
• Ban ACL key Changes in ACLs
• Block to-local Traffic
• RFC 9211: HTTP Cache-Status support
• RFC 9111: Stop treating Warning specially
• ext_kerberos_ldap_group_acl: Support -b with -D
• Remove Gopher Protocol Support
• Remove Outdated Tools

PR: 275639
Reported by: timp87@gmail.com (maintainer)