Remove unused header

Author: zfergus

src/is_vertex_manifold.cpp

@@ -3,7 +3,6 @@
 #include <nanobind/nanobind.h>
 #include <nanobind/ndarray.h>
 #include <nanobind/eigen/dense.h>
-#include <nanobind/stl/tuple.h>
 
 namespace nb = nanobind;
 using namespace nb::literals;