multimedia/tautulli: Update 2.16.0 => 2.18.1 (14 CVEs)

Changelog:
https://github.com/Tautulli/Tautulli/blob/v2.18.1/CHANGELOG.md

PR: 295759
Approved by: christer.edwards@gmail.com (maintainer, timeout 2 weeks)
Security: CVE-2026-49995
Security: CVE-2026-45381
Security: CVE-2026-52835
Security: CVE-2026-54915
Security: CVE-2026-41065
Security: CVE-2026-40605
Security: CVE-2026-43984
Security: CVE-2026-43986
Security: CVE-2026-43985
Security: CVE-2026-28505
Security: CVE-2026-31831
Security: CVE-2026-31799
Security: CVE-2026-32275
Security: CVE-2026-31804
Sponsored by: UNIS Labs
MFH: 2026Q3

(cherry picked from commit 404b001f83102a2d1885d25248f3f09c763d5a52)