Use ST_Y() instead of the deprecated/removed Y() in test

Fix #74779: x() and y() truncating floats to integers

We must not use the locale dependent `atof()`, but instead use the
(hopefully) locale independent `zend_strtod()`, when converting s

Fix #74779: x() and y() truncating floats to integers

We must not use the locale dependent `atof()`, but instead use the
(hopefully) locale independent `zend_strtod()`, when converting string
representations of floating point numbers which are sent by the server.

Closes GH-6665.

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