databases/ruby-activerecord52: update to 5.2.4.2

Update ruby-activerecord52 to 5.2.4.2.

## Rails 5.2.4.1 (December 18, 2019) ##

*  No changes.

## Rails 5.2.4 (November 27, 2019) ##

*  Fix circular `autosave: true` causes invalid records to be saved.

    Prior to the fix, when there was a circular series of `autosave: true`
    associations, the callback for a `has_many` association was run while
    another instance of the same callback on the same association hadn't
    finished running. When control returned to the first instance of the
    callback, the instance variable had changed, and subsequent associated
    records weren't saved correctly. Specifically, the ID field for the
    `belongs_to` corresponding to the `has_many` was `nil`.

    Fixes #28080.

    *Larry Reid*

*  PostgreSQL: Fix GROUP BY with ORDER BY virtual count attribute.

    Fixes #36022.

    *Ryuta Kamizono*

*  Fix sqlite3 collation parsing when using decimal columns.

    *Martin R. Schuster*

*  Make ActiveRecord `ConnectionPool.connections` method thread-safe.

    Fixes #36465.

    *Jeff Doering*

*  Assign all attributes before calling `build` to ensure the child record is visible in
    `before_add` and `after_add` callbacks for `has_many :through` associations.

    Fixes #33249.

    *Ryan H. Kerr*

(taca)