libstdc++ in Julia is outdated compared to the system (Linux) one

[dav2017]

libstdc++.so.6: version GLIBCXX_3.4.26' not found`

My system: Manjaro Linux
Julia version: both 1.3.1 and 1.4.0

The error is the same described on Discourse here and can be temporarily solved in the same way.
The problem: libstdc++ coming with Julia is outdated compared to the system one.
A workaround is to copy (or link) the system libstdc++.so.6 to the Julia folder:
cp /usr/lib/x86_64-linux-gnu/libstdc++.so.6 $JULIA_HOME/lib/julia/

I recently experienced the problem using PyPlot, which resulted in the following error (I submitted the same issue here in PyPlot.jl):

ERROR: InitError: PyError (PyImport_ImportModule

The Python package matplotlib could not be found by pyimport. Usually this means
that you did not install matplotlib in the Python version being used by PyCall.
[...]
ImportError("/usr/local/julia-1.4.0/bin/../lib/julia/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /usr/lib/python3.8/site-packages/matplotlib/ft2font.cpython-38-x86_64-linux-gnu.so)")

[laborg]

I think this is a duplicate to: #34276
(I'll link the issue on discourse to make it more accessible)