graphics/openexr*: Security update to 3.4.11

Changelog:
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.11

PR: 294882
Security: 787cde46-4424-11f1-943f-05b19d100dca

		CVE-2026-42217
		CVE-2026-42216
		CVE-2026-41142

MFH: 2026Q2
Pull Request: https://github.com/freebsd/freebsd-ports/pull/511

(cherry picked from commit 782fe1731d04b9842442b7e06b28c43884dcd542)