docs(releasenotes): update release date (#2115)

Author: wpbonelli

doc/ReleaseNotes/ReleaseNotes.tex

@@ -180,7 +180,7 @@ \section{Release History}
 6.4.3 & February 7, 2024 & \url{https://doi.org/10.5066/P9FL1JCC} \\
 6.4.4 & February 13, 2024 & \url{https://doi.org/10.5066/P9FL1JCC} \\
 6.5.0 & May 23, 2024 & \url{https://doi.org/10.5066/P13COJJM} \\
-6.6.0 & December 23, 2024 & \url{https://doi.org/10.5066/P1DXFBUR} \\
+6.6.0 & December 19, 2024 & \url{https://doi.org/10.5066/P1DXFBUR} \\
 \hline
 \label{tab:releases}
 \end{tabular*}