Remove similar specialization with Integers (#56881)

This method seems unnecessary, as the method on line 830 does the same
thing. Having this method in `Base` requires packages to disambiguate
against this by adding redundant methods.

base/abstractarray.jl

@@ -828,7 +828,6 @@ similar(a::AbstractArray, ::Type{T}, dims::DimOrInd...) where {T}  = similar(a,
 # define this method to convert supported axes to Ints, with the expectation that an offset array
 # package will define a method with dims::Tuple{Union{Integer, UnitRange}, Vararg{Union{Integer, UnitRange}}}
 similar(a::AbstractArray, ::Type{T}, dims::Tuple{Union{Integer, OneTo}, Vararg{Union{Integer, OneTo}}}) where {T} = similar(a, T, to_shape(dims))
-similar(a::AbstractArray, ::Type{T}, dims::Tuple{Integer, Vararg{Integer}}) where {T} = similar(a, T, to_shape(dims))
 # similar creates an Array by default
 similar(a::AbstractArray, ::Type{T}, dims::Dims{N}) where {T,N}    = Array{T,N}(undef, dims)