[cmake] Bump Version number to 3.3.1

Author: Wentzell

CMakeLists.txt

@@ -41,7 +41,7 @@ if(POLICY CMP0144)
   cmake_policy(SET CMP0144 NEW)
 endif()
 
-project(TRIQS VERSION 3.3.0 LANGUAGES CXX)
+project(TRIQS VERSION 3.3.1 LANGUAGES CXX)
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
 ## C & C++ Headers