fixup gcc support

Author: taepper

src/silo/preprocessing/preprocessing.test.cpp

@@ -76,10 +76,10 @@ silo::config::PreprocessingConfig prepareInputDirAndPreprocessorForScenario(
    config_with_input_dir.initialization_files.directory = input_directory;
    config_with_input_dir.input_file = "input.json";
    if (not scenario.lineage_trees.empty()) {
+      auto keys = scenario.lineage_trees | std::views::keys |
+                  std::views::transform([](const std::filesystem::path& p) { return p.string(); });
       config_with_input_dir.initialization_files.lineage_definition_files =
-         scenario.lineage_trees | std::views::keys |
-         std::views::transform([](const std::filesystem::path& p) { return p.string(); }) |
-         std::ranges::to<std::vector<std::string>>();
+         std::vector<std::string>(keys.begin(), keys.end());
    }
    config_with_input_dir.validate();