Unable to process numeric types

When trying to process numeric types I receive the following stack trace.

`
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 -org.postgresql.util.PSQLException: Bad value for type BigDecimal : 0.05
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.postgresql.jdbc.PgResultSet.scaleBigDecimal(PgResultSet.java:2913)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.postgresql.jdbc.PgResultSet.getNumeric(PgResultSet.java:2350)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.postgresql.jdbc.PgResultSet.getBigDecimal(PgResultSet.java:2314)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at io.aiven.connect.jdbc.dialect.GenericDatabaseDialect.lambda$columnConverterFor$20(GenericDatabaseDialect.java:1181)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at io.aiven.connect.jdbc.source.SchemaMapping$FieldSetter.setField(SchemaMapping.java:161)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at io.aiven.connect.jdbc.source.TimestampIncrementingTableQuerier.extractRecord(TimestampIncrementingTableQuerier.java:197)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at io.aiven.connect.jdbc.source.JdbcSourceTask.poll(JdbcSourceTask.java:326)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.apache.kafka.connect.runtime.WorkerSourceTask.poll(WorkerSourceTask.java:291)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:248)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:189)
17 Sep 2021 16:41:02.476tm-staging-selachii-db-kafka-connect-4 - at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:238)
17 Sep 2021 16:41:02.477tm-staging-selachii-db-kafka-connect-4 - at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
17 Sep 2021 16:41:02.477tm-staging-selachii-db-kafka-connect-4 - at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
17 Sep 2021 16:41:02.477tm-staging-selachii-db-kafka-connect-4 - at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
17 Sep 2021 16:41:02.477tm-staging-selachii-db-kafka-connect-4 - at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)`

I suspect the issue may be related to the use of getBigDecimal since passing a scale is deprecated and the crash occurs when scaling the decimal.

https://github.com/aiven/aiven-kafka-connect-jdbc/blob/master/src/main/java/io/aiven/connect/jdbc/dialect/GenericDatabaseDialect.java#L1181

https://docs.oracle.com/javase/7/docs/api/java/sql/ResultSet.html#getBigDecimal(int,%20int)

We're running AIven JDBC Source connector version 6.6.0 on Kafka Connect 2.7.1 (Aiven hosted) and are querying Postgres 13.4 (Aiven hosted)