Bump msgpuck submodule

This update pulls the following commits:

* Add mp_check_on_error callback
* Make test output TAP compatible

It also drops the msgpack test result file because the test was switched
to the TAP compatible format.

Needed for #7968

NO_DOC=internal
NO_CHANGELOG=internal

msgpuck @ 671c6185

-Subproject commit 4d8a3c5cac6cb306556758f2aaf2838826364efb
+Subproject commit 671c6185950f34756fe7a127862d12a6dff19fac