NCI-Agency/anet#398: Use mssql-jdbc 7.1 preview for java.time support
NCI-Agency/anet#398: Use mssql-jdbc 7.1 preview for java.time support

Supports at least java.time.LocalDateTime, see:
  https://blogs.msdn.microsoft.com/jdbcteam/2018/08/29/early-technical-preview-of-jdbc-7-1-0-for-sql-server-released/

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