[SPARK-31168][BUILD][FOLLOWUP] Update scala-2.12 profile

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR is a follow-up of #32697 to update the missed part.
After SPARK-34774, we have Scala 2.12 version in scala-2.12 profile.

Why are the changes needed?

To be consistent.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Pass the CIs and manual.

BEFORE

$ build/mvn help:evaluate -Pscala-2.12 -Dexpression=scala.version | grep "^2.12"
Using `mvn` from path: /usr/local/bin/mvn
2.12.10

AFTER

$ build/mvn help:evaluate -Pscala-2.12 -Dexpression=scala.version | grep "^2.12"
Using `mvn` from path: /usr/local/bin/mvn
2.12.14

[dongjoon-hyun]

Thank you, @viirya !

[dongjoon-hyun]

I manually verified this with the following.

BEFORE

$ build/mvn help:evaluate -Pscala-2.12 -Dexpression=scala.version | grep "^2.12"
Using `mvn` from path: /usr/local/bin/mvn
2.12.10

AFTER

$ build/mvn help:evaluate -Pscala-2.12 -Dexpression=scala.version | grep "^2.12"
Using `mvn` from path: /usr/local/bin/mvn
2.12.14

Merged to master!

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/43612/

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/43612/

[SparkQA]

Test build #139091 has finished for PR 32707 at commit 53c55de.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.