* Added C standard gnu23 to the makefile
* Added gnu23 standard to all test modue makefiles
* Added installation of latest gcc version to tests workflow
* Fixed typo in previous commit
* Made GCC 14 installation conditional and moved from the workflow to the script
* Extracted GCC version check to external script for CI and created tests README
* Added #!/bin/bash
* Make check_gcc_version.sh executable
