Merge branch 'develop' into techdebt/5708-meta-cleanup

Conflicts:
- include/nlohmann/detail/conversions/from_json.hpp: kept the shared from_json_pair_array_to_map() body; develop's #5681 element-path fix (&p instead of &j) is already applied there
- include/nlohmann/detail/json_pointer.hpp: kept the parse_array_index()-based contains(); it already returns false for an empty token (#5614) and only uses documented StringType members (#5692)
- include/nlohmann/detail/macro_scope.hpp: combined develop's #5698 NLOHMANN_JSON_SERIALIZE_ENUM_STRICT message with the ::nlohmann::detail::templated_json_throw qualification
- single_include/nlohmann/json.hpp: regenerated with make amalgamate

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/detail/json_pointer.hpp

@@ -26,6 +26,7 @@
 #include <nlohmann/detail/macro_scope.hpp>
 #include <nlohmann/detail/string_concat.hpp>
 #include <nlohmann/detail/string_escape.hpp>
+#include <nlohmann/detail/string_utils.hpp>
 #include <nlohmann/detail/value_t.hpp>
 
 NLOHMANN_JSON_NAMESPACE_BEGIN
@@ -116,7 +117,7 @@ class json_pointer
     /// @sa https://json.nlohmann.me/api/json_pointer/operator_slasheq/
     json_pointer& operator/=(std::size_t array_idx)
     {
-        return *this /= std::to_string(array_idx);
+        return *this /= detail::to_string<string_t>(array_idx);
     }
 
     /// @brief create a new JSON pointer by appending the right JSON pointer at the end of the left JSON pointer