catch_xmlwriter build error gcc 13,14

[dakka]

Describe the bug
Compilation error C++20

gcc 12 ok, 13 and 14 error

/home/davidd/prog/fiber_new/build/_deps/catch2-src/src/catch2/../catch2/internal/catch_xmlwriter.hpp:18:10: warning: elaborated-type-specifier for a scoped enum must not use the ‘class’ keyword
|     enum class XmlFormatting : uint8_t {
|     ~~~~ ^~~~~
/home/davidd/prog/fiber_new/build/_deps/catch2-src/src/catch2/../catch2/internal/catch_xmlwriter.hpp:18:30: error: found ‘:’ in nested-name-specifier, expected ‘::’ 
   18 |     enum class XmlFormatting : uint8_t { 

Expected behavior
Should compile

Platform information:

• OS: Ubuntu 24.04.1 LTS
• Compiler+version: GCC v14.01 g++ -ggdb -O3 -std=gnu++20
• Catch version: devel

Built in cmake using fetchcontent

Suggested fix

#include <cstdint>

[dakka]

Thanks for sorting that out so quickly