Update dependency doctrine/orm to v3.3.1

This MR contains the following updates:

Package	Type	Update	Change
doctrine/orm (source)	require	patch	3.3.0 -> 3.3.1

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Release Notes

doctrine/orm (doctrine/orm)

v3.3.1

Compare Source

Release Notes for 3.3.1

3.3.1

• Total issues resolved: 0
• Total pull requests resolved: 9
• Total contributors: 5

Bugfixes

• 11549: Allow overriding association's cascade thanks to @​malarzm

Improvement

• 11725: Use properties over array keys thanks to @​greg0ire

Documentation

• 11693: UPGRADE: mention SqlWalker deprecations in 3.3 thanks to @​janedbal
• 11685: Remove YAML doc example thanks to @​greg0ire
• 11672: Update branch metadata thanks to @​greg0ire
• 11344: Change the lock mode in the "Aggregate Fields" cookbook (aggregate-fields.rst) article. thanks to @​d-ph

CI

• 11681: Tell dependabot to target 2.20.x thanks to @​derrabus
• 11678: Close stale pull requests thanks to @​derrabus

Test Suite

• 11674: Drop DBAL 2 compat code thanks to @​derrabus

This release includes all the changes from https://github.com/doctrine/orm/releases/tag/2.20.1

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