[SPARK-31567][R][TESTS] Update AppVeyor Rtools to 4.0.0
[SPARK-31567][R][TESTS] Update AppVeyor Rtools to 4.0.0

### What changes were proposed in this pull request?

This aims to upgrade Rtools first to prepare R 4.0.0 in AppVeyor for Apache Spark 3.1.0.

### Why are the changes needed?

R 4.0.0 is released on April 24th, 2020. It uses Rtools 4.0.0 officially.
- https://cran.r-project.org/doc/manuals/r-release/NEWS.html
- https://stat.ethz.ch/pipermail/r-announce/2020/000653.html

### Does this PR introduce any user-facing change?

No. (This PR aims to test Rtools 4.0.0 in AppVeyor environment.)

### How was this patch tested?

See the AppVeyor result.

Closes #28358 from dongjoon-hyun/SPARK-31567.

Authored-by: Dongjoon Hyun <6ff48b33cbb828151035af58a92f18a39f1d1036@apache.org>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

zuotingbing/spark,dongjoon-hyun/spark,HyukjinKwon/spark,ConeyLiu/spark,ueshin/apache-spark,WeichenXu123/spark,chuckchen/spark,apache/spark,gengliangwang/spark,zuotingbing/spark,witgo/spark,shaneknapp/spark,xuanyuanking/spark,milliman/spark,chuckchen/spark,dbtsai/spark,nchammas/spark,taroplus/spark,ConeyLiu/spark,wangmiao1981/spark,ConeyLiu/spark,apache/spark,apache/spark,zzcclp/spark,cloud-fan/spark,vinodkc/spark,dbtsai/spark,wzhfy/spark,zzcclp/spark,maropu/spark,HyukjinKwon/spark,ptkool/spark,mahak/spark,holdenk/spark,BryanCutler/spark,xuanyuanking/spark,rednaxelafx/apache-spark,spark-test/spark,zuotingbing/spark,ptkool/spark,wangyum/spark,ueshin/apache-spark,ptkool/spark,JoshRosen/spark,rednaxelafx/apache-spark,wangmiao1981/spark,cloud-fan/spark,shaneknapp/spark,hvanhovell/spark,jiangxb1987/spark,zuotingbing/spark,taroplus/spark,JoshRosen/spark,wzhfy/spark,dongjoon-hyun/spark,zuotingbing/spark,JoshRosen/spark,witgo/spark,cloud-fan/spark,maropu/spark,BryanCutler/spark,wangyum/spark,ptkool/spark,gengliangwang/spark,maropu/spark,srowen/spark,wangyum/spark,jiangxb1987/spark,ptkool/spark,taroplus/spark,HyukjinKwon/spark,jiangxb1987/spark,wzhfy/spark,hvanhovell/spark,zzcclp/spark,taroplus/spark,dongjoon-hyun/spark,xuanyuanking/spark,wzhfy/spark,zero323/spark,spark-test/spark,wangyum/spark,jiangxb1987/spark,kevinyu98/spark,zzcclp/spark,milliman/spark,witgo/spark,shaneknapp/spark,xuanyuanking/spark,ueshin/apache-spark,holdenk/spark,BryanCutler/spark,kevinyu98/spark,rednaxelafx/apache-spark,taroplus/spark,shuangshuangwang/spark,cloud-fan/spark,zero323/spark,vinodkc/spark,vinodkc/spark,wangyum/spark,milliman/spark,cloud-fan/spark,HyukjinKwon/spark,dongjoon-hyun/spark,ueshin/apache-spark,wzhfy/spark,taroplus/spark,srowen/spark,ueshin/apache-spark,vinodkc/spark,jiangxb1987/spark,wangyum/spark,zzcclp/spark,dbtsai/spark,srowen/spark,rednaxelafx/apache-spark,apache/spark,milliman/spark,milliman/spark,shaneknapp/spark,witgo/spark,kevinyu98/spark,zero323/spark,dbtsai/spark,mahak/spark,shuangshuangwang/spark,spark-test/spark,hvanhovell/spark,WeichenXu123/spark,JoshRosen/spark,zero323/spark,holdenk/spark,wangmiao1981/spark,nchammas/spark,ptkool/spark,ConeyLiu/spark,wzhfy/spark,xuanyuanking/spark,srowen/spark,WeichenXu123/spark,zzcclp/spark,apache/spark,zzcclp/spark,hvanhovell/spark,holdenk/spark,JoshRosen/spark,ConeyLiu/spark,dbtsai/spark,witgo/spark,srowen/spark,gengliangwang/spark,WeichenXu123/spark,nchammas/spark,wangmiao1981/spark,zero323/spark,spark-test/spark,wzhfy/spark,vinodkc/spark,rednaxelafx/apache-spark,JoshRosen/spark,vinodkc/spark,holdenk/spark,nchammas/spark,zero323/spark,dongjoon-hyun/spark,spark-test/spark,HyukjinKwon/spark,mahak/spark,wangmiao1981/spark,spark-test/spark,cloud-fan/spark,nchammas/spark,mahak/spark,holdenk/spark,JoshRosen/spark,nchammas/spark,shaneknapp/spark,chuckchen/spark,xuanyuanking/spark,kevinyu98/spark,maropu/spark,witgo/spark,nchammas/spark,BryanCutler/spark,BryanCutler/spark,WeichenXu123/spark,jiangxb1987/spark,maropu/spark,wangmiao1981/spark,HyukjinKwon/spark,kevinyu98/spark,taroplus/spark,WeichenXu123/spark,shuangshuangwang/spark,chuckchen/spark,xuanyuanking/spark,chuckchen/spark,shuangshuangwang/spark,shuangshuangwang/spark,gengliangwang/spark,maropu/spark,gengliangwang/spark,ptkool/spark,rednaxelafx/apache-spark,dbtsai/spark,wangmiao1981/spark,zero323/spark,srowen/spark,cloud-fan/spark,ueshin/apache-spark,shuangshuangwang/spark,rednaxelafx/apache-spark,shuangshuangwang/spark,mahak/spark,apache/spark,dongjoon-hyun/spark,BryanCutler/spark,dbtsai/spark,mahak/spark,ConeyLiu/spark,chuckchen/spark,zuotingbing/spark,HyukjinKwon/spark,shaneknapp/spark,hvanhovell/spark,apache/spark,holdenk/spark,srowen/spark,ueshin/apache-spark,vinodkc/spark,mahak/spark,kevinyu98/spark,hvanhovell/spark,dongjoon-hyun/spark,gengliangwang/spark,zuotingbing/spark,spark-test/spark,maropu/spark,gengliangwang/spark,witgo/spark,milliman/spark,chuckchen/spark,jiangxb1987/spark,WeichenXu123/spark,milliman/spark,shaneknapp/spark,ConeyLiu/spark,wangyum/spark,hvanhovell/spark,kevinyu98/spark,BryanCutler/spark