Mongoid 7.5.3 released

[Dmitry_Rybakov]

Mongoid 7.5.3 is a patch release in 7.5 series with a few bug fixes:

• MONGOID-5546 First/Last failures when empty hash passed as criteria
• MONGOID-5582 Support shard keys based on subdocument fields
• MONGOID-5352 Fix assign_attributes on replacing embeds_many

The following additional improvements were made:

• MONGOID-5590 Shard keys do not support fields with “.” in their name