PARQUET-1976: Update Scala and Maven plugin versions

[martin-g]

Use scala-maven-plugin instead of the old maven-scala-plugin. Update Scala version to 2.12.13

Make sure you have checked all steps below.

Jira

• [ X ] My PR addresses the following Parquet Jira issues and references them in the PR title."
  • https://issues.apache.org/jira/browse/PARQUET-1976

Tests

• [ X ] My PR does not need testing for this extremely good reason: Only versions are being updated and no code changed are made. Old tests should be enough.

Commits

• [ X ] My commits all reference Jira issues in their subject lines. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• [ X ] No new functionality, thus no need of new documentation

[martin-g]

I think it is better, in the end, to inherit versions from the Parent Apache POM. WDYT?

Let me know if this is what Parquet team prefers and I will update the PR!

[akauppi]

Looking at Parquet, with Scala 2.13 in mind.