Version mismatch between 2.1.3 tag and `memtier_benchmark --version`

Building the 2.1.3 tag produces this behaviour:
```
$ memtier_benchmark --version
memtier_benchmark 2.1.2
Copyright (C) 2011-2024 Redis Ltd.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.
```