Explicit float64 assumption in /Bridges/Constraint/rsoc.jl

[JiazhengZhu]

This line in rsoc.jl introduces an explicit float64 assumption:
https://github.com/JuliaOpt/MathOptInterface.jl/blob/345c03b96b53a35f7e583754de81e584c3841bff/src/Bridges/Constraint/rsoc.jl#L28

This will produce MethodError: no method matching operate!(::typeof(/), ::Type{BigFloat}, ::MathOptInterface.ScalarAffineFunction{BigFloat}, ::Float64) at the next line
https://github.com/JuliaOpt/MathOptInterface.jl/blob/345c03b96b53a35f7e583754de81e584c3841bff/src/Bridges/Constraint/rsoc.jl#L29
when using other number types such as BigFloat.