security/vuxml: Register multiple www/squid vulnerabilities

Denial of Service in FTP
Base Score: 8.6
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Request/Response smuggling in HTTP/1.1 and ICAP
Base Score: 9.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Denial of Service in HTTP Digest Authentication
Base Score: 9.9
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H