chore(deps): update dependency ecto_sql to v3.12.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ecto_sql (source)	prod	minor	3.11.2 -> 3.12.1

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Release Notes

elixir-ecto/ecto_sql (ecto_sql)

v3.12.1

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Enhancements

• [sql] Support :pool_count option

v3.12.0

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Enhancements

• [Ecto.Migration] Add Ecto.Migration.remove_if_exists/1
• [Ecto.Migrator] Warn for migration files that end in .ex
• [sql] Support for subqueries in order_bys and group_bys
• [mysql] Add check constraints for MySQL
• [postgres] Add native bitstring support to Postgres
• [postgres] Add support for :duration type
• [postgres] Add :plan explain option for Postgres
• [tds] Allow passing %Tds.Parameter structs as params for named parameter usage in query

Bug fix

• [mysql] Type cast of integers in MySQL should use signed integers

v3.11.3

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Enhancements

• [mysql] Relax myxql dependency

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