devel/ruby-activemodel52: update to 5.2.3

## Rails 5.2.3 (March 27, 2019) ##

*  Fix date value when casting a multiparameter date hash to not convert
    from Gregorian date to Julian date.

    Before:

        Day.new({"day(1i)"=>"1", "day(2i)"=>"1", "day(3i)"=>"1"})
        => #<Day id: nil, day: "0001-01-03", created_at: nil, updated_at: nil>

    After:

        Day.new({"day(1i)"=>"1", "day(2i)"=>"1", "day(3i)"=>"1"})
        => #<Day id: nil, day: "0001-01-01", created_at: nil, updated_at: nil>

    Fixes #28521.

    *Sayan Chakraborty*

*  Fix numericality equality validation of `BigDecimal` and `Float`
    by casting to `BigDecimal` on both ends of the validation.

    *Gannon McGibbon*

## Rails 5.2.2.1 (March 11, 2019) ##

*  No changes.

(taca)