Add missing NOLINT

Author: Skylion007

tests/test_stl.cpp

@@ -401,6 +401,7 @@ TEST_SUBMODULE(stl, m) {
     m.def("half_or_none_refsensitive", [](int x) -> refsensitive_opt_int {
         return x ? refsensitive_opt_int(x / 2) : refsensitive_opt_int();
     });
+    // NOLINTNEXTLINE(performance-unnecessary-value-param)
     m.def("test_nullopt_refsensitive", [](refsensitive_opt_int x) {
         return x ? x.value() : 42;
     }, py::arg_v("x", refsensitive_opt_int(), "None"));