patch 9.0.1680: sodium test fails in Github CI

patch 9.0.1680: sodium test fails in Github CI

Problem:    sodium test fails in Github CI
Solution:   Catch sodium_mlock() errors and do not error out

sodium_mlock() seems to fail consistently on the Github CI. Perhaps
[sodium_mlock()](https://libsodium.gitbook.io/doc/memory_management#text-locking-memory)
is called too often or with too much memory by the runners so
that this starts failing.

Let's just try to catch this and skip the test, when this starts
happening.

closes: #12751