[BUG] random_configuration_model(n::T, ks::Vector{T}) fails when {T} is not {Int64}

[tlcz]

Description of bug
call to random_configuration_model(n::Int32, ks::Vector{Int32}) fails with exception:

ERROR: MethodError: Cannot `convert` an object of type 
  LightGraphs.SimpleGraphs.SimpleEdge{Int64} to an object of type 
  LightGraphs.SimpleGraphs.SimpleEdge{Int32}
Closest candidates are:
  convert(::Type{T}, ::T) where T at essentials.jl:205
  LightGraphs.SimpleGraphs.SimpleEdge{T}(::LightGraphs.SimpleGraphs.AbstractSimpleEdge) where T<:Integer at /home/tomek/.julia/packages/LightGraphs/IgJif/src/SimpleGraphs/simpleedge.jl:29
  LightGraphs.SimpleGraphs.SimpleEdge{T}(::Any, ::Any) where T<:Integer at /home/tomek/.julia/packages/LightGraphs/IgJif/src/SimpleGraphs/simpleedge.jl:7
Stacktrace:
 [1] setindex!(h::Dict{LightGraphs.SimpleGraphs.SimpleEdge{Int32}, Nothing}, v0::Nothing, key0::LightGraphs.SimpleGraphs.SimpleEdge{Int64})
   @ Base ./dict.jl:374
 [2] push!(s::Set{LightGraphs.SimpleGraphs.SimpleEdge{Int32}}, x::LightGraphs.SimpleGraphs.SimpleEdge{Int64})
   @ Base ./set.jl:57
 [3] _try_creation(n::Int32, k::Vector{Int32}, rng::Random._GLOBAL_RNG)
   @ LightGraphs.SimpleGraphs ~/.julia/packages/LightGraphs/IgJif/src/SimpleGraphs/generators/randgraphs.jl:308
 [4] random_configuration_model(n::Int32, k::Vector{Int32}; seed::Int64, check_graphical::Bool)
   @ LightGraphs.SimpleGraphs ~/.julia/packages/LightGraphs/IgJif/src/SimpleGraphs/generators/randgraphs.jl:736
 [5] random_configuration_model(n::Int32, k::Vector{Int32})
   @ LightGraphs.SimpleGraphs ~/.julia/packages/LightGraphs/IgJif/src/SimpleGraphs/generators/randgraphs.jl:727
 [6] top-level scope
   @ ./timing.jl:210 [inlined]
 [7] top-level scope
   @ ./REPL[4]:0

How to reproduce

julia> using LightGraphs
julia> n = Int32(1e6);
julia> ks = rand(Base.OneTo(Int32(20)),n);
julia> g = random_configuration_model(n, ks)

Expected behavior
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Actual behavior
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Code demonstrating bug
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Version information

• output from versioninfo() surrounded by backticks (``)

Julia Version 1.6.1
Commit 6aaedecc44 (2021-04-23 05:59 UTC)
Platform Info:
 OS: Linux (x86_64-pc-linux-gnu)
 CPU: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
 WORD_SIZE: 64
 LIBM: libopenlibm
 LLVM: libLLVM-11.0.1 (ORCJIT, skylake)

• output from ] status LightGraphs surrounded by backticks (``)

(@v1.6) pkg> status LightGraphs
      Status `~/.julia/environments/v1.6/Project.toml`
  [093fc24a] LightGraphs v1.3.5

Additional context
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