julia

0130f65c - Restore valgrind suppressions file

Restore valgrind suppressions file contrib/valgrind-julia.supp was removed in #38970, but it is still referenced [in the Valgrind devdocs](https://docs.julialang.org/en/v1/devdocs/valgrind/). Either the file should be restored, or the reference should be removed from the documentation. Here, I have chosen the option of restoring the file, as I think it provides some value. I have also updated it such that it does indeed suppress the warning (#4533) on the latest master.