fix: workaround GCC bug

see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105329

server/CMakeLists.txt

@@ -37,6 +37,7 @@ if(BUILD_TESTING)
     CXX_STANDARD 20
     CXX_CLANG_TIDY ""
   )
+  target_compile_options(Catch2 PRIVATE -Wno-restrict) # workaround GCC bug
   add_executable(traintastic-server-test test/main.cpp)
   add_dependencies(traintastic-server-test traintastic-lang)
   target_compile_definitions(traintastic-server-test PRIVATE -DTRAINTASTIC_TEST)