Update dependency doctrine/orm to v2.15.2

This MR contains the following updates:

Package	Type	Update	Change
doctrine/orm (source)	require	patch	2.15.1 -> 2.15.2

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Release Notes

doctrine/orm

v2.15.2

Compare Source

Release Notes for 2.15.2

2.15.x bugfix release (patch)

2.15.2

• Total issues resolved: 0
• Total pull requests resolved: 8
• Total contributors: 8

Documentation

• 10734: Document pdo_sqlite requirement for tests thanks to @​greg0ire
• 10708: Correct docs link thanks to @​mbabker
• 10686: Documentation typo thanks to @​edent

Bugfixes

• 10666: Create ReflectionReadonlyProperty from their declaring class so their value can be set thanks to @​MatTheCat
• 10643: Fix single table inheritance with intermediate abstract class(es) thanks to @​htto
• 10508: Fix id hash of entity with enum as identifier thanks to @​Gwemox
• 10486: Fix to-many collections left in dirty state after entities are removed by the UoW thanks to @​mpdude

Deprecation fixes

• 10737: Fix deprecations from doctrine/lexer thanks to @​nicolas-grekas

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