Travis : Update to GafferHQ/dependencies 0.54.0.0-rc2
Travis : Update to GafferHQ/dependencies 0.54.0.0-rc2

andrewkaufman/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,boberfly/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,hradec/gaffer,appleseedhq/gaffer,hradec/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,boberfly/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,boberfly/gaffer,lucienfostier/gaffer,hradec/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,boberfly/gaffer,ImageEngine/gaffer,hradec/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,hradec/gaffer,johnhaddon/gaffer,GafferHQ/gaffer