Increase version number to 9.2 and update PDF version of software manual

doc/software-manual.tex

@@ -205,7 +205,7 @@ fontsize=\footnotesize}
 \maketitle
 \begin{abstract}
 This document is a user manual describing usage of the VTM reference software
-for the VVC project. It applies to version 9.0 of the software.
+for the VVC project. It applies to version 9.2 of the software.
 \end{abstract}
 
 \tableofcontents

source/Lib/CommonLib/version.h

 #if ! defined( VTM_VERSION )
-#define VTM_VERSION "9.1"
+#define VTM_VERSION "9.2"
 #endif