Pepare release candidtate by remoing beta suffix

CMakeLists.txt

@@ -188,7 +188,7 @@ endif()
 project(mixxx VERSION 2.4.0)
 enable_language(C CXX)
 # Work around missing version suffixes support https://gitlab.kitware.com/cmake/cmake/-/issues/16716
-set(MIXXX_VERSION_PRERELEASE "beta") # set to "alpha" "beta" or ""
+set(MIXXX_VERSION_PRERELEASE "") # set to "alpha" "beta" or ""
 
 set(CMAKE_PROJECT_HOMEPAGE_URL "https://www.mixxx.org")
 set(CMAKE_PROJECT_DESCRIPTION "Mixxx is Free DJ software that gives you everything you need to perform live mixes.")