security/mbedtls4: Update 4.1.0 => 4.2.0 (fix 10 CVEs)

Changelog:
https://github.com/Mbed-TLS/mbedtls/releases/tag/mbedtls-4.2.0

• Parametrize PKGNAMESUFFIX.
• Improve PORTSCOUT.

PR: 296595
Security: CVE-2026-50581
Security: CVE-2026-50640
Security: CVE-2026-50580
Security: CVE-2026-50586
Security: CVE-2026-50588
Security: CVE-2026-50579
Security: CVE-2026-54441
Security: CVE-2026-50585
Security: CVE-2026-25832
Security: CVE-2026-49300
Sponsored by: UNIS Labs
MFH: 2026Q2

(cherry picked from commit 2162d1df3425fc85695529db4ba754c57766aab1)