Broken REPL syntax highlighting of multi-line inputs

The julia-console.cson grammar is now in use for syntax highlighting of Julia-REPL code blocks on GitHub:

julia> foo(x) = 2*x
foo (generic function with 1 method)

julia> foo(2)
4

julia> rand(3, 3)
3×3 Matrix{Float64}:
 0.0584225  0.130169  0.71839
 0.374485   0.915134  0.546367
 0.757699   0.195205  0.549311
 
julia> d = Dict(1 => 'a', 2 => 'b')
Dict{Int64, Char} with 2 entries:
  2 => 'b'
  1 => 'a'

However, multi-line input isn't highlighted correctly, only covering the first line:

julia> function bar(x)
         return x
       end
bar (generic function with 1 method)


julia> d = Dict(
         1 => 'a',
         2 => 'b',
       )
Dict{Int64, Char} with 2 entries:
  2 => 'b'
  1 => 'a'

CC @giordano.

Start by inspecting grammars/julia-console.cson and compare its handling of single-line versus multi-line Julia-REPL inputs using the examples in the issue. Verify how GitHub renders Julia-repl blocks, then ensure function and dictionary inputs remain highlighted across continuation lines and their output. Confirm the rendered examples match the intended highlighting.