firefox version update: add 91.3.0-1.el7, remove 78.14.0-1.el7
Latest CentOS patching updated firefox to version 91.3.0-1.el7. Added this version, removed oldest .el7 version (78.14.0-1.el7) from firefox line in snapchk.conf.
Latest CentOS patching updated firefox to version 91.3.0-1.el7. Added this version, removed oldest .el7 version (78.14.0-1.el7) from firefox line in snapchk.conf.