Use specific PGTimestamp postgresql class for timestamp binding to avoid ERROR: could not determine data type of parameter error

This is a proposed improvement for https://jira.spring.io/browse/SPR-16719

Comment From: pivotal-issuemaster

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Comment From: pivotal-issuemaster

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Comment From: jhoeller

See my comment on #21260: This is too specific a workaround for something that could easily be handled within the Postgres JDBC driver itself. Thanks for the pull request, in any case!