Fix AAStex 6.3.1's bug causing line numbers in Acknowledgments

arXiv didn't like this.

src/tex/ms.tex

@@ -806,7 +806,9 @@ \section{Conclusions}\label{sec:conclusions}
 As we have demonstrated, it appears realistic that an empirical test of the habitable zone hypothesis is imminent.
 The confirmation or rejection of the habitable zone inner edge discontinuity will be a key contribution to understanding the diversity of exoplanet climates and the search for extraterrestrial life in the Universe.
 
-\begin{acknowledgments}
+%\begin{acknowledgments}
+\pagebreak[4]
+\section*{Acknowledgments}
 The authors thank Gabriele Cugno, Yann Fabel, Brad Foley, Lisa Kaltenegger, Ravi Kopparapu, Eric Mamajek, Megan Mansfield, Paul Molliere, Gijs Mulders, Matthew Murphy, Sukrit Ranjan, and Terry-Ann Suer for insightful discussions.
 We are grateful to Martin Turbet for providing the mass-radius relationship data for planets harboring steam atmospheres.
 We thank the anonymous referees for providing insightful reports that helped to improve this manuscript.
@@ -816,7 +818,7 @@ \section{Conclusions}\label{sec:conclusions}
 T.L. was supported by a grant from the Branco Weiss Foundation.
 G.B. acknowledges support from the NASA Astrophysics Data Analysis Program under Grant No.~80NSSC20K0446.
 A.S. acknowledges support from NASA's Habitable Worlds Program (No.~80NSSC20K0226).
-\end{acknowledgments}
+%\end{acknowledgments}
 
 \section*{Author contributions}
 M.S., D.A., and T.L.\ conceived the project, planned its implementation, and interpreted the results.