Proposed Changes

Adding cstdint header to printing_toolbox.hpp.

Reason

I was building SU2 from source this morning. Running ninja threw an compilation error with a comment to import cstdint in printing_toolbox.hpp since uint8_t is not defined in the scope:

...
../SU2_CFD/src/output/filewriter/CParaviewXMLFileWriter.cpp:240:10: error: ‘uint8_t’ was not declared in this scope
  240 |   vector<uint8_t> typeBuf(myElem);
      |          ^~~~~~~
../SU2_CFD/src/output/filewriter/CParaviewXMLFileWriter.cpp:30:1: note: ‘uint8_t’ is defined in header ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
   29 | #include "../../../../Common/include/toolboxes/printing_toolbox.hpp"
  +++ |+#include <cstdint>
   30 | 
...

Adding the header solves the issue.

Here some additional information:
OS: Fedora 38
Configuration: MPI, pythonwrapper, autodiff
Compiler: g++ 13.1.1

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.