fix: using __cpp_nontype_template_args instead of __cpp_nontype_template_parameter_class (#5330)

* fix: use `__cpp_nontype_template_args` instead of gnu extensions

* fix: add feature test value

* fix: change `PYBIND11_TYPING_H_HAS_STRING_LITERAL` skip reason

Author: ObeliskGate

include/pybind11/typing.h

@@ -100,9 +100,7 @@ class Never : public none {
     using none::none;
 };
 
-#if defined(__cpp_nontype_template_parameter_class)                                               \
-    && (/* See #5201 */ !defined(__GNUC__)                                                        \
-        || (__GNUC__ > 10 || (__GNUC__ == 10 && __GNUC_MINOR__ >= 3)))
+#if defined(__cpp_nontype_template_args) && __cpp_nontype_template_args >= 201911L
 #    define PYBIND11_TYPING_H_HAS_STRING_LITERAL
 template <size_t N>
 struct StringLiteral {

tests/test_pytypes.py

@@ -1026,7 +1026,7 @@ def test_optional_object_annotations(doc):
 
 @pytest.mark.skipif(
     not m.defined_PYBIND11_TYPING_H_HAS_STRING_LITERAL,
-    reason="C++20 feature not available.",
+    reason="C++20 non-type template args feature not available.",
 )
 def test_literal(doc):
     assert (
@@ -1037,7 +1037,7 @@ def test_literal(doc):
 
 @pytest.mark.skipif(
     not m.defined_PYBIND11_TYPING_H_HAS_STRING_LITERAL,
-    reason="C++20 feature not available.",
+    reason="C++20 non-type template args feature not available.",
 )
 def test_typevar(doc):
     assert (