<!--- This environment context section helps us quickly review your PR. 
      Please take a minute to fill-out this information. -->

## Environment
**Liquibase Version**: 4.2.0

**Liquibase Integration & Version**: any

**Liquibase Extension(s) & Version**: liquibase-cosmosdb

**Database Vendor & Version**: Cosmos DB

**Operating System Type & Version**: Windows

## Description
By introducing the CockroachDatabase support

* isCorrectDatabaseImplementation method fails with cast exception when using a NoSql extension: java.lang.ClassCastException: liquibase.ext.cosmosdb.database.CosmosConnection cannot be cast to liquibase.database.jvm.JdbcConnection
* worth checking first that conn is instance of JdbcConnection and return false if not


package liquibase.database.core;
import liquibase.database.DatabaseConnection;
import liquibase.database.jvm.JdbcConnection;
import liquibase.exception.DatabaseException;
import liquibase.util.JdbcUtils;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class CockroachDatabase extends PostgresDatabase {
    public CockroachDatabase() {
        super.setCurrentDateTimeFunction("NOW()");
    }
    @Override
    public int getPriority() {
        return super.getPriority() + 5;
    }
    @Override
    public String getShortName() {
        return "cockroachdb";
    }
    @Override
    protected String getDefaultDatabaseProductName() {
        return "CockroachDB";
    }
    @Override