[3.x] fix unit tests MSSQL (Windows)

[heelc29]

Summary of Changes

Currently, dependencies that may be incompatible with the php version are being installed during the MSSQL (win) tests.

In this particular case, doctrine/instantiator is required by phpunit, which causes the error for php 8.1 and 8.2.
Here is the relevant commit which requires a newer php version doctrine/instantiator@21dcb5f

The new syntax requires php 8.3 https://www.php.net/releases/8.3/en.php#typed_class_constants

private const SERIALIZATION_FORMAT_USE_UNSERIALIZER   = 'C';
private const SERIALIZATION_FORMAT_AVOID_UNSERIALIZER = 'O';

private const string SERIALIZATION_FORMAT_USE_UNSERIALIZER   = 'C';
private const string SERIALIZATION_FORMAT_AVOID_UNSERIALIZER = 'O';

So, as at the other tests, we should use composer update instead of composer install --ignore-platform-reqs.

Testing Instructions

unit tests

Documentation Changes Required

no

[richard67]

Thanks.