Centering and vertically-aligning two side-by-side listings

This may well not be the most minimal solution but it works, I think.

\documentclass{article}

\usepackage{listings}
\usepackage{caption}
\usepackage{adjustbox}
\begin{document}

\begin{figure}[ht]
    \centering
    \begin{adjustbox}{valign=t,minipage=0.45\linewidth}
        \centering
        \begin{tabular}{c}
            \begin{lstlisting}
here is some code
that is not as long
as the other code
            \end{lstlisting}
        \end{tabular}
    \end{adjustbox}
    \begin{adjustbox}{valign=t,minipage=0.45\linewidth}
        \centering
        \begin{tabular}{c}
            \begin{lstlisting}
here is some code
that is a bit longer
than the other code
so I would like the
two listings to be
vertically aligned
at the top
            \end{lstlisting}
        \end{tabular}
    \end{adjustbox}
    \caption{test}
\end{figure}

\end{document}