security/vuxml: Document multiple Unbound vulnerabilities

• CVE-2026-32792
• CVE-2026-33278
• CVE-2026-40622
• CVE-2026-41292
• CVE-2026-42534
• CVE-2026-42923
• CVE-2026-42944
• CVE-2026-42959
• CVE-2026-42960
• CVE-2026-44390
• CVE-2026-44608

References:
https://www.nlnetlabs.nl/projects/unbound/security-advisories/

PR: 295442
Sponsored by: Rubicon Communications, LLC ("Netgate")