update GLCI to use more recent win r-devel, which is 4.0 already, clo… (#3975)
update GLCI to use more recent win r-devel, which is 4.0 already, clo… (#3975)


jangorecki/data.table,jangorecki/data.table,Rdatatable/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,vlulla/data.table