openimageio: update to v2.5.15.0, old versions not buildable anymore … #418

Job	Run time
changes	27s
prechecks / bootstrap-dev-rhel8	4m 11s
prechecks / style	59s
prechecks / validate	33s
prechecks / import-check	43s
prechecks / audit / package-audits (windows-latest, powershell Invoke-Expression -Command "./share/spack/qa/windows_t...	2m 37s
prechecks / audit / package-audits (ubuntu-latest, bash)	4m 11s
prechecks / audit / package-audits (macos-latest, bash)	2m 49s
all-prechecks	1s
unit-tests	0s
bootstrap	0s
upload-coverage	0s
all	0s
	16m 31s

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