[dumux] Bump up version to 2.10-git

dune.module

 Module: dumux
-Version: 2.9-git
+Version: 2.10-git
 Maintainer: dumux@listserv.uni-stuttgart.de
 Depends: dune-grid (>= 2.4) dune-localfunctions (>= 2.4) dune-istl (>= 2.4)
 Suggests: dune-alugrid (>=2.4) dune-pdelab (>=2.0) dune-multidomain dune-cornerpoint dune-foamgrid (>=2.4)