Revert "fix Spark version"
Revert "fix Spark version"

This reverts commit 6a2f4348ae2b0b1f78924b1af2354ca89c6c974d.

nchammas/spark,holdenk/spark,hvanhovell/spark,nchammas/spark,taroplus/spark,xuanyuanking/spark,wangyum/spark,jiangxb1987/spark,srowen/spark,HyukjinKwon/spark,holdenk/spark,dongjoon-hyun/spark,rednaxelafx/apache-spark,ueshin/apache-spark,xuanyuanking/spark,wangyum/spark,cloud-fan/spark,rednaxelafx/apache-spark,vinodkc/spark,witgo/spark,HyukjinKwon/spark,ueshin/apache-spark,HyukjinKwon/spark,vinodkc/spark,cloud-fan/spark,srowen/spark,jiangxb1987/spark,JoshRosen/spark,JoshRosen/spark,vinodkc/spark,witgo/spark,chuckchen/spark,mahak/spark,srowen/spark,HyukjinKwon/spark,shaneknapp/spark,cloud-fan/spark,gengliangwang/spark,zzcclp/spark,dongjoon-hyun/spark,ueshin/apache-spark,ueshin/apache-spark,hvanhovell/spark,nchammas/spark,vinodkc/spark,gengliangwang/spark,milliman/spark,witgo/spark,hvanhovell/spark,srowen/spark,gengliangwang/spark,jiangxb1987/spark,taroplus/spark,zero323/spark,milliman/spark,shaneknapp/spark,milliman/spark,hvanhovell/spark,ueshin/apache-spark,nchammas/spark,cloud-fan/spark,wangyum/spark,srowen/spark,HyukjinKwon/spark,shaneknapp/spark,taroplus/spark,WeichenXu123/spark,HyukjinKwon/spark,wangyum/spark,JoshRosen/spark,rednaxelafx/apache-spark,vinodkc/spark,dongjoon-hyun/spark,zzcclp/spark,rednaxelafx/apache-spark,shaneknapp/spark,dongjoon-hyun/spark,apache/spark,srowen/spark,zzcclp/spark,holdenk/spark,mahak/spark,dongjoon-hyun/spark,mahak/spark,WeichenXu123/spark,JoshRosen/spark,JoshRosen/spark,cloud-fan/spark,apache/spark,hvanhovell/spark,WeichenXu123/spark,shaneknapp/spark,xuanyuanking/spark,witgo/spark,chuckchen/spark,apache/spark,chuckchen/spark,apache/spark,apache/spark,holdenk/spark,dongjoon-hyun/spark,chuckchen/spark,zero323/spark,holdenk/spark,nchammas/spark,chuckchen/spark,zero323/spark,milliman/spark,taroplus/spark,zero323/spark,WeichenXu123/spark,wangyum/spark,xuanyuanking/spark,milliman/spark,holdenk/spark,xuanyuanking/spark,gengliangwang/spark,zero323/spark,JoshRosen/spark,ueshin/apache-spark,witgo/spark,zzcclp/spark,WeichenXu123/spark,chuckchen/spark,xuanyuanking/spark,cloud-fan/spark,jiangxb1987/spark,rednaxelafx/apache-spark,zero323/spark,milliman/spark,ueshin/apache-spark,jiangxb1987/spark,WeichenXu123/spark,nchammas/spark,zzcclp/spark,vinodkc/spark,rednaxelafx/apache-spark,JoshRosen/spark,taroplus/spark,zzcclp/spark,wangyum/spark,jiangxb1987/spark,mahak/spark,nchammas/spark,holdenk/spark,taroplus/spark,dongjoon-hyun/spark,xuanyuanking/spark,jiangxb1987/spark,milliman/spark,witgo/spark,taroplus/spark,shaneknapp/spark,gengliangwang/spark,hvanhovell/spark,mahak/spark,mahak/spark,mahak/spark,gengliangwang/spark,witgo/spark,rednaxelafx/apache-spark,zero323/spark,hvanhovell/spark,cloud-fan/spark,gengliangwang/spark,wangyum/spark,apache/spark,HyukjinKwon/spark,apache/spark,chuckchen/spark,vinodkc/spark,zzcclp/spark,shaneknapp/spark,srowen/spark,WeichenXu123/spark