worker: add missing const

worker/src/worker/main.cpp

@@ -123,7 +123,7 @@ int main(int argc, char* argv[])
         thrAlgorithmListWorker = std::thread([&]() { algorithmListWorker->listen(); });
         evaluateGraphWorker->listen();
         thrAlgorithmListWorker.join();
-    } catch (std::exception& e) {
+    } catch (const std::exception& e) {
         spdlog::error("{}", e.what());
         returnCode = EXIT_FAILURE;
     }