Remove the Rails 3.2 duration patch

It reopened Integer and Float to work around duration arithmetic under Ruby
2.4 and Rails 3.2, and has been shadowing ActiveSupport's own helpers ever
since. Its months were exactly 30 days and its years 365.25, both differing
from ActiveSupport's constants, and it built Duration parts as an array of
pairs rather than a hash, recording weeks as days and hours and minutes as
seconds

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