Allow pydict accept Pair args

[mkitti]

Create a method pydict(pairs::Pair...) similar to Dict(::Pair...).

This allow for the following usage.

julia>using PythonCall julia> Dict("a"=>5, "b"=>6) Dict{String, Int64} with 2 entries:"b"=>6"a"=>5 julia> pydict("a"=>5, "b"=>6) Python:{'a': 5, 'b': 6}

[mkitti]

@cjdoris There seems to be an issue with Python 3.13 per the failing test.

xref: JuliaLang/julia#58475

[cjdoris]

Good idea, thanks.