[SPARK-33636][PYTHON][ML][FOLLOWUP] Update since tag of labelsArray in StringIndexer
[SPARK-33636][PYTHON][ML][FOLLOWUP] Update since tag of labelsArray in StringIndexer

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

This is to update `labelsArray`'s since tag.

### Why are the changes needed?

The original change was backported to branch-3.0 for 3.0.2 version. So it is better to update the since tag to reflect the fact.

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

No

### How was this patch tested?

N/A. Just tag change.

Closes #30582 from viirya/SPARK-33636-followup.

Authored-by: Liang-Chi Hsieh <d24118b4297e1ecf0c990d6935f5f9e6e4fd7701@gmail.com>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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