Use net.alchim31.maven:scala-maven-plugin instead of org.scala-tools:maven-scala-plugin

org.scala-tools:maven-scala-plugin is not maintained since a long time.

[net.alchim31.maven:scala-maven-plugin](https://github.com/davidB/scala-maven-plugin) is the replacement.

Also Scala version could be upgraded from 2.12.8 to 2.12.13

Few other Maven plugins also could be upgraded.

**Reporter**: [Martin Tzvetanov Grigorov](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mgrigorov) / @martin-g
#### PRs and other links:
- [Pull Request](https://github.com/apache/parquet-mr/pull/866)

_{**Note**: *This issue was originally created as [PARQUET-1976](https://issues.apache.org/jira/browse/PARQUET-1976). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

首先检查 org.scala-tools:maven-scala-plugin 的 Maven 构建配置以及 Scala 2.12.8 版本。查看链接的 Pull Request 866 和迁移文档，然后验证替代插件及所述版本更新已得到反映，并且 Maven 构建仍能通过。

由索引模型根据 Issue 内容生成。