[doc] bump handbook version to 3.3-git

doc/handbook/0_dumux-handbook.tex

@@ -42,7 +42,7 @@
 % Dune and Dumux logo
 \newcommand{\Dune}{{DUNE}\xspace}
 \newcommand{\Dumux}{\texorpdfstring{Du\-Mu$^\text{x}$\xspace}{DuMuX\xspace}}
-\newcommand{\DumuxVersion}{3.2-git}
+\newcommand{\DumuxVersion}{3.3-git}
 \definecolor{dumuxYellow}{HTML}{E19417}
 \definecolor{dumuxBlue}{HTML}{0C73CF}