Pglast

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- Update libpg_query to `15-4.2.0`__

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- No visible changes with respect to v4, apart from the support for new/revised syntaxes of
`PostgreSQL 15`__

__ https://www.postgresql.org/docs/15/release-15.html

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**Breaking changes**
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- Target PostgreSQL 15, thanks to libpg_query `15-4.0.0`__

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- Use `Cython 3.0.2`__

__ https://github.com/cython/cython/blob/master/CHANGES.rst#302-2023-08-27

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- Fix issues `129`__ and `130`__ (merged from `version 3.18`__)

__ https://github.com/lelit/pglast/issues/129
__ https://github.com/lelit/pglast/issues/130
__ `3.18 (2023-08-24)`_

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- Fix `serialization issue`__ when column's ``DEFAULT`` value is an expression

__ https://github.com/pganalyze/libpg_query/issues/188

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- Handle special syntax required by ``SET TIME ZONE INTERVAL '-08:00' hour to minute``

- Fix mistype mapping of raw C "long" and "double" attributes, that were decorated with the
wrong Python type