Missing libstdc++6 versions on CentOS when using AppImage

[hpuhr]

When using the AppImage in CentOS 7.7, a user reported the following error:

It seems to be related to CentOS using a very old version of the C++ standard library, which can be resolved by updating the compiler, as stated in:

https://unix.stackexchange.com/questions/503358/missing-lib64-libstdc-so-6-version-cxxabi-1-3-8-and-cxxabi-1-3-9-on-cento