graphics/openexr*: Update to v3.3.4

Changelog: https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.4
MFH: 2025Q2
(cherry picked from commit 01fd7c5307391115aaab0a3d2f2461f63fd5ea84)

This includes:
graphics/openexr-website-docs: fix up distinfo

(cherry picked from commit fcc91a72315bc03e93cd48418b8d6f7090bb2bbd)