[SPARK-34507][BUILD] Update scala.version in parent POM when changing Scala version for cross-build
[SPARK-34507][BUILD] Update scala.version in parent POM when changing Scala version for cross-build

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

The `change-scala-version.sh` script updates Scala versions across the build for cross-build purposes. It manually changes `scala.binary.version` but not `scala.version`.

### Why are the changes needed?

It seems that this has always been an oversight, and the cross-built builds of Spark have an incorrect scala.version. See 2.4.5's 2.12 POM for example, which shows a Scala 2.11 version.
https://search.maven.org/artifact/org.apache.spark/spark-core_2.12/2.4.5/pom

More comments in the JIRA.

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

Should be a build-only bug fix.

### How was this patch tested?

Existing tests, but really N/A

Closes #31801 from srowen/SPARK-34507.

Authored-by: Sean Owen <d519fa33a62684a61ab04b24d26f83452d51b34c@gmail.com>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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