security/modsecurity3: Update to 3.0.15

Changes: https://github.com/owasp-modsecurity/ModSecurity/blob/v3.0.15/CHANGES
this fix CVE-2026-42268 CVE-2026-30923

Pass maintainership to submitter

PR: 294932
Approved by: marius.halden@modirum.com
Sponsored by: Netzkommune GmbH