message: Bump ORCA version to 2.56.0
diff: @@ -5,8 +5,8 @@ project(gpopt LANGUAGES CXX C)
  set(CMAKE_CXX_STANDARD 98)
  set(GPORCA_VERSION_MAJOR 2)
  -set(GPORCA_VERSION_MINOR 55)
  -set(GPORCA_VERSION_PATCH 20)
  +set(GPORCA_VERSION_MINOR 56)
  +set(GPORCA_VERSION_PATCH 0)
  set(GPORCA_VERSION_STRING "${GPORCA_VERSION_MAJOR}.${GPORCA_VERSION_MINOR}.${GPORCA_VERSION_PATCH}")
  # Whenever an ABI-breaking change is made to GPORCA, this should be incremented.
  