graphics/openexr*: Security update to 3.4.9

Addresses several security vulnerabilities

Changelog:
https://github.com/AcademySoftwareFoundation/openexr/blob/v3.4.9/CHANGES.md#version-349-april--3-2026

PR: 294197
Security: CVE-2026-34589, CVE-2026-34588, CVE-2026-34380,

		CVE-2026-34379, CVE-2026-34378,
		adb096d4-2e72-11f1-acc1-339a1a6999b0

(cherry picked from commit ff3b84dc9b80acb9e6a7a86b837898d4e7687580)