ENH: update centos7 build image to 7.9 same version as HAL
ENH: update centos7 build image to 7.9 same version as HAL

orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB