core: rename mbgl namespace to mln (#4487)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

platform/windows/src/thread.cpp

@@ -43,7 +43,7 @@ THREAD_INFO* GetCurrentThreadInfo() {
     return info;
 }
 
-namespace mbgl {
+namespace mln {
 namespace platform {
 
 std::string getCurrentThreadName() {
@@ -87,4 +87,4 @@ void attachThread() {}
 void detachThread() {}
 
 } // namespace platform
-} // namespace mbgl
+} // namespace mln