missing Scala 2.12 build of HBase connector

See the following SBT log.

```

[error] (update) sbt.librarymanagement.ResolveException: unresolved dependency: org.apache.flink#flink-hbase_2.12;1.7.0: Resolution failed several times for dependency: org.apache.flink#flink-hbase_2.12;1.7.0 {compile=[default(compile)]}::
[error]     java.text.ParseException: inconsistent module descriptor file found in 'https://repo1.maven.org/maven2/org/apache/flink/flink-hbase_2.12/1.7.0/flink-hbase_2.12-1.7.0.pom': bad module name: expected='flink-hbase_2.12' found='flink-hbase_2.11';
[error]     java.text.ParseException: inconsistent module descriptor file found in 'https://repo1.maven.org/maven2/org/apache/flink/flink-hbase_2.12/1.7.0/flink-hbase_2.12-1.7.0.pom': bad module name: expected='flink-hbase_2.12' found='flink-hbase_2.11';

```