chore(master): release closure_tree 9.0.0

[github-actions[bot]]

:robot: I have created a release beep boop

9.0.0 (2025-11-23)

Features

• add PostgreSQL schema-qualified table name support (#462) (5f9006c)
• Add runtime advisory lock name customization and multi-database documentation (#454) (d6ffd73)
• migrate from ActiveSupport::Autoload to Zeitwerk (#457) (d18e80c)
• rewrite with clean api (#451) (f56f2e1)

Bug Fixes

• add implicit_order_column for Rails 8.1+ compatibility (#464) (f384303)
• configure release-please to recognize v8.0.0 release (#455) (fc34f21)
• eager loading of hierarchies by defining the primary key (#465) (8c7e490)
• hierarchy class inheritance to avoid STI validations (#392) (#472) (73b07a6)
• restore proper deprecation for database_less configuration (#459) (de8b402)

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