Fix version

Author: karnkaul

lib/src/version.hpp.in

@@ -1,5 +1,5 @@
 #include <string_view>
 
 namespace capo {
-inline constexpr std::string_view version_v{"@CMAKE_PROJECT_VERSION@"};
+inline constexpr std::string_view version_v{"@capo_version@"};
 } // namespace capo