Update the benchmarks with Jemalloc master

Jemalloc for contingent reasons has not seen a release since mi-2019.
It would be more fair and intellectually interesting to benchmarck latest mimalloc with latest jemalloc because it has received many improvements since then.
Also, do the benchmarks use the sized deallocation apis?
Not passing the size of the object to free prevent a lot of optimizations for jemalloc (but you probably already know that ;) )

I would be very interested in such results and mimalloc is for sure a nice technology.

No files, tests, or benchmark entry points are identified in the issue. First locate the benchmark setup and determine which mimalloc and jemalloc revisions and deallocation APIs it uses; the work is done when current versions are compared consistently and the sized-deallocation behavior is documented in the results.

Written by the indexing model from the issue text.