add Manu Seth as a new committer (#19191)
add Manu Seth as a new committer (#19191)


szha/mxnet,yajiedesign/mxnet,leezu/mxnet,tlby/mxnet,yajiedesign/mxnet,leezu/mxnet,yajiedesign/mxnet,apache/incubator-mxnet,sxjscience/mxnet,yajiedesign/mxnet,szha/mxnet,tlby/mxnet,leezu/mxnet,leezu/mxnet,tlby/mxnet,szha/mxnet,DickJC123/mxnet,sxjscience/mxnet,yajiedesign/mxnet,apache/incubator-mxnet,leezu/mxnet,szha/mxnet,sxjscience/mxnet,sxjscience/mxnet,apache/incubator-mxnet,sxjscience/mxnet,DickJC123/mxnet,sxjscience/mxnet,leezu/mxnet,apache/incubator-mxnet,leezu/mxnet,szha/mxnet,leezu/mxnet,DickJC123/mxnet,yajiedesign/mxnet,szha/mxnet,sxjscience/mxnet,szha/mxnet,leezu/mxnet,tlby/mxnet,tlby/mxnet,szha/mxnet,yajiedesign/mxnet,yajiedesign/mxnet,tlby/mxnet,sxjscience/mxnet,tlby/mxnet,szha/mxnet,sxjscience/mxnet,tlby/mxnet,DickJC123/mxnet,tlby/mxnet,yajiedesign/mxnet,tlby/mxnet