Fix ambiguous call with untyped int literal in {JSON,YAML}::Any.new

[straight-shoota]

Adds a workaround for #11645

[HertzDevil]

Do you think we also need similar overloads for the smaller integer types?

[straight-shoota]

Perhaps. But the main intention is to get it working with untyped literals.
Ideal solution would be fixing the autocasting.

[HertzDevil]

I don't think we need to restrict ourselves to the number types supported by the Anys, instead we could just support all of them:

def initialize(@raw : Type)
end

# this overload goes below the `Type` one to avoid an infinite recursion,
# as the two overloads are unordered
def self.new(raw : Int)
  new(raw.to_i64)
end

def self.new(raw : Float)
  new(raw.to_f64)
end