Revert: use stock OIIO 3.1, see if we used the right span calls

Signed-off-by: Larry Gritz <[email protected]>

Author: lgritz

.github/workflows/ci.yml

@@ -695,8 +695,6 @@ jobs:
                             OPTIX_VERSION=8.0.0
                             CTEST_EXCLUSIONS="broken|render-microfacet|example-cuda|python-oslquery"
                             USE_JXL=0
-                            OPENIMAGEIO_REPO=lgritz/OpenImageIO
-                            OPENIMAGEIO_VERSION="lg-setpixels"
             depcmds: >
                 sudo rm -rf /usr/local/include/OpenImageIO &&
                 sudo rm -rf /usr/local/lib*/cmake/OpenImageIO &&