Upgrade to clang-tidy 18 (#6919)

include/extractor/serialization.hpp

@@ -215,7 +215,6 @@ inline void read(storage::tar::FileReader &reader,
                  const std::string &name,
                  detail::NameTableImpl<Ownership> &name_table)
 {
-    std::string buffer;
     util::serialization::read(reader, name, name_table.indexed_data);
 }
 } // namespace osrm::extractor::serialization

include/storage/shared_memory.hpp

@@ -61,7 +61,7 @@ class SharedMemory
         {
             shm = boost::interprocess::xsi_shared_memory(boost::interprocess::open_only, key);
 
-            util::Log(logDEBUG) << "opening " << (int)shm.get_shmid() << " from id " << (int)id;
+            util::Log(logDEBUG) << "opening " << shm.get_shmid() << " from id " << (int)id;
 
             region = boost::interprocess::mapped_region(shm, boost::interprocess::read_only);
         }