:art: fix indentation

tests/src/unit-bon8.cpp

diff --git a/tests/src/unit-bon8.cpp b/tests/src/unit-bon8.cpp
index bf3e99c..f69286a 100644
--- a/tests/src/unit-bon8.cpp
+++ b/tests/src/unit-bon8.cpp
@@ -32,7 +32,7 @@
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 #ifdef JSON_TEST_NO_GLOBAL_UDLS
-using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
+    using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 #endif
 
 #include <iostream>