saving a circuit with latex method as a PDF fails

[nwlambert]

If a user wants to call

circuit.draw(renderer="latex", file_type="pdf", file_name="circuit")

it fails with

TypeError: TeXRenderer._convert_pdf() takes 1 positional argument but 2 were given

This is because https://github.com/qutip/qutip-qip/blob/7633f6e4dbae7e6931eda800df21d42016df8431/src/qutip_qip/circuit/texrenderer.py#L267C4-L267C33

is called with a DPI argument.